Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f542d7c35cc9459…

MALICIOUS

PDF

88.1 KB Created: 2021-08-08 02:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5dd7b006eb3f0400a09d7e128523c46b SHA-1: 074096ca847398e7202e99a7d87a9f1f1dbc43de SHA-256: 1f542d7c35cc945906d6d3f425f1fe102a41a23377536c33087f7c72ad6bebc4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. The document body, though obfuscated, suggests it's a lure, likely for phishing or a scam, by presenting itself as an instruction manual. The presence of embedded URLs and the callback lure heuristic further support a phishing or scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=bixler+3+instruction+manual PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c1a6369ef---sufigi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c0515fcf310bc86188dbfb31b131d30a/95564630023.pdfIn PDF document text
    • http://northcity.rs/slike/files/gavez.pdfIn PDF document text
    • http://acril.ru/ufiles/files/zokonunilerudefisamevosuf.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/vutofikigotudura.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/tofiketuv.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/67698688585.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/84008516754.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756021a3086---vikaxagaladavuze.pdfIn PDF document text
    • http://cocoal.com/uploads/file/pinasarugo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb3a0ecda---xejemubaberikave.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fe50eb86703---67545079197.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/35708115752.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/f7cfeb38900d6d339a5994a844f3cc97/lopexemorasevatut.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3701770998.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/dadikunudowirubigarufixa.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/87936547933.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fab5bb7cb---somukuwizokavakisugetimi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f8888bec1c9---36378780178.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/wulewobubipeti.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/dedb0c327f25d3dd9865819262d6eaf5/punejexewan.pdfIn PDF document text
    • https://gozdemsigorta.com/hulya/upload/files/48434641466.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/tujesagere.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 10816 bytes
SHA-256: ec27f6655ea6cf4276e7e9afbc57758588e1e747244a9495b421575b329c4f37
font_02_sfnt_off000123e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 18212 bytes
SHA-256: 90437ed2bd62352aaa7d8281dae88e0c29a3148312ccf951d8e16c24a0d3123c

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