Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb937d5c683c33c5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 22:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70b7944e8a57b4dd5b6a522fa092cb8b SHA-1: c4c69e25a98435862d8d3abc7811121c6894bc3c SHA-256: cb937d5c683c33c5941e7716bb4800dcbe2d1545f0475d0bfd3615f395b8c7f7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains that appear to be part of a link farm or hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lure users to external resources, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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://poslovniimenik.net/firme_data/files/27328021596.pdf In PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/59300018891.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/gamaruwogediw.pdfIn PDF document text
    • https://t2sc.me/userfiles/54333340399.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/57885287658.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/2693793784.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/99760616379.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/59907894195.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/85c83c04f78133570dd7a1ab5283da67/11417817073.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/48630388119.pdfIn PDF document text
    • https://seerupit.dk/assens/file/26017373630.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/pizenuzidozivuzuwevimire.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad33ef13d---40803513816.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/voreza.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210906172212_1379675976.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f21191e657---xazabotadaputir.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/36817794944.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tepomewogusaxafikopiwale.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/bewemisidotezodok.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/bemurawiw.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/34906136071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=unlock+bootloader+xiaomi+without+pcPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 18488 bytes
SHA-256: 67f85933e5ec779bee81e21516ba6c409ec78621c92b8bdd58e8aba5bf169148
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 11136 bytes
SHA-256: 5b5cf49c159287810d2f55632f99d79b645da0e22d7e8c71696b9213012eb86e

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