Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b6a1833bdfffb0…

MALICIOUS

PDF

93.0 KB Created: 2021-09-19 00:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04830bc69558f0924612ca2d3683359e SHA-1: 41033b68599519b3aa2340a24e8813fdd4f14c63 SHA-256: d6b6a1833bdfffb093990f0acddb6dcc36363d3a4235fa54acd448183565b63c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=vfly+video+editor PDF link annotation
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09acb6ad5---mawepix.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/gowobigenumegu.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/rawad.pdfIn PDF document text
    • http://ausafe.net/images/art/files/1700648260.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/1537051635.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c4f62cbd---jedojazuxukijowes.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/tonaduvatuku.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/71488296721.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/60587380025.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/62362610095.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/dezotowasofitovuxuj.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vovonufigujasuwugejesava.pdfIn PDF document text
    • http://contelex.it/userfiles/files/fexik.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/51851776424.pdfIn PDF document text
    • https://onecre.com/images/content/files/99544908977.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/96400631951.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c603275287---bufodolezatatogej.pdfIn PDF document text
    • https://kratky.eu/files/file/pisowasemada.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/94700786780.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/kajujeluje.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/74510705512.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/sedutigotokojiledemesar.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/mulogoforipim.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/xodez.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/xavirapupudomukoma.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/raduvazibopobevufata.pdfIn PDF document text
    • 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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 23300 bytes
SHA-256: 5ce74bf047f20b582d20705b0fa15b4dfbf86c4249082be263b0ab146f3b0756
font_03_sfnt_off00014f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F71 10060 bytes
SHA-256: e0a6da40730550d5970c8dbb47fba43e091f9231ca29ecd5a28c973dc6f1900b

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