Malicious PDF — malware analysis report

Static analysis result for SHA-256 d676a8dfa4a2c5fa…

MALICIOUS

PDF

70.1 KB Created: 2021-09-20 02:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d28293d6fe034027b319d6df5789e147 SHA-1: 94eeb0210e1a42734263068195db9ccd06914138 SHA-256: d676a8dfa4a2c5fa316c1372adabc322afd2b32c3cefa79b10d8e50f43387bff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ride.hu/images/uploads/files/58800643129.pdf In PDF document text
    • http://aligokdemir.com/resimler/files/zemipifa.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/jorobafubuxopezegamunus.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zagizizomijubamifirex.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8f012a9e8---62187507313.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/30656249589.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/rarowero.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/20163149589.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/tumizugatovibisugujafisiv.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/sofigidulira.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/xajokoxoxapup.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/80695326491.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/xuzulobafu.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/67023501473.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/6395513383.pdfIn PDF document text
    • http://anm-av.de/uploads/files/dowoligemozikidijerufanu.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/97065779636.pdfIn PDF document text
    • http://ciskmv.com/css/file/13188247859.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/kigoziresosuzovilarax.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/46990461514.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/lugawotirara.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2vsb2t0bai55k4ccisi7fngcmn/zizoladasiterapu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344769e399e---70029709196.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f97defcf1---86843862019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=broken+screen+mobile+data+recoveryPDF 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_off0000b369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 10996 bytes
SHA-256: 79f37bceef09d29d25c0979358d7f3bbe680e2dce62ca54eb7a32bbbdcc54858
font_02_sfnt_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 15140 bytes
SHA-256: 17f9bfad4e379092b3d98125ddb57505bc2196d36c0f120642076af549c715e5

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