Malicious PDF — malware analysis report

Static analysis result for SHA-256 d654bb8f5090866a…

MALICIOUS

PDF

88.8 KB Created: 2021-07-05 18:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 93c8f8bfa73e448457095a9ba1d5ae15 SHA-1: cc2b6f65de8b1148da92da5a2338280f01870105 SHA-256: d654bb8f5090866acb91cf204cffd288f673b425a35fbc1a0550fa929186572e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous URLs strongly indicates a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ee586f68---16246300747.pdf In PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/dewasazeg.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af83f3659---joxek.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ec6dc473---fudevabenitapar.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/madaf.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f4et976ddjilqs6jpt7b7949l4/muvozorazadij.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8fd1ac1812fbe245e72ff2497fc57643/34951866878.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/duc91flgoirf5oho9v5mvn34mi/97912559652.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/um8pcdc7li3pfaf52uu36qmci3/93462796674.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/94a44mn2v5bbrqkidjk40nniea/72933468795.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f2s4h2llogq3i41t05l4bdat44/21057704593.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe9aee857---27735913781.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb541e1a2---woterofevizusinovitigisi.pdfIn PDF document text
    • http://simonide.org/userfiles/file/95606830740.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/bokovusonosawos.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b54c1830---dolugoxesa.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/vovuromejipu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d094859e66---gazudigejemuvetoneto.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/93668106561.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/18534629376.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a5f3390dbfb3a88df7db883f6faa07fa/pukemofikesin.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//jikesimumebo.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/xodux.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d13a0128---86155841572.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/59991977985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=logical+level+of+database+is+also+known+asPDF 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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 16636 bytes
SHA-256: d49c5179b9d26d5e2bfcddd15c47b594c4ee5bf57a65d251a1e8ed9a4dbc5e06
font_02_sfnt_off00013c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9E 10892 bytes
SHA-256: 098656f110fb8c4147ecc60857fcbd9c4f8e11e01fedf542e110750ff1efdade