Malicious PDF — malware analysis report

Static analysis result for SHA-256 56485e00ec59b944…

MALICIOUS

PDF

91.5 KB Created: 2021-08-17 12:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bedf17b8c08e1fbb0d8df24a9efbcdd4 SHA-1: 5bfe56403e8e49fbe926b16c332bb86d3bfca080 SHA-256: 56485e00ec59b94496cd3487a1f8eb08feeb81f6735cc6199d82d72c0936b7c0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://zpb-maciejewski.pl/upload/fck/file/jolisonebobife.pdf In PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/8250140863.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/baraxavu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/jljvurk95qptlp5chaue8u1t2s/xabukebevoroziwokekizuza.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/xatuxus.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/72430522518.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/8797921691.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/zolekerol.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3gieq9rd5238m1h6drgv5uc4s6/51920479281.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8864cf456---87856248585.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b934b2936e9---watokixiverizukig.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/844oqr1a1fk0mjcis2im4btit5/werugikururoselaf.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/1e21fb5b75b6f0a99fbd743ac2ac02d8/42264744643.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9i5rorn4kceojg0g3hk95745ng/78030275853.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/51154a4acd7a25bf2acc9a8d3041c240/kenozadeladuterereka.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/rk8iu90qkaqmvahn1gheqdm8ul/74463971461.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/raxikalagaj.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/zisumemalelizu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625219741.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/kinuwilivuwebokesona.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0cb892b53293ddc9a0d368aac2c0ae43/gadafun.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/19632641401.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/34284508284.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075791d056---61734072068.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/56209840353.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa66641c2---4031857858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+strong+in+mafia+cityPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10824 bytes
SHA-256: 1b4348c9ca5c579935c4ff9245e86fe9a804286ba39dfe58a8af1dd316a7afa8
font_01_sfnt_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 17564 bytes
SHA-256: 97a27de04d0f2539456f7add25a843bd24f8516f96a9f25a309b6839aa43afd6
font_02_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 4740 bytes
SHA-256: 1e8a48392531bd93152bcf747ed603400a5dcb4e543ab2855ffd08a18a211252
font_03_sfnt_off000146f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1