Malicious PDF — malware analysis report

Static analysis result for SHA-256 2086277a89917a4d…

MALICIOUS

PDF

93.3 KB Created: 2021-07-27 08:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4375fe9af4a36f4d94f9e8a07b163158 SHA-1: 19e306fc9d804799874ba5dbb14e38a9188ccb6e SHA-256: 2086277a89917a4d2ab0aefade2a0afa70ccf56ce1605233d3162d6ae6895eba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing lure, prompting the user to contact a provided phone number for issues related to billing or refunds. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the document's structure and embedded URLs suggest it is part of a phishing campaign designed to trick users into revealing sensitive information or falling victim to a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f59a628f---jimuzibirewo.pdf In PDF document text
    • https://amd-export.com/site/upload/file/bubemomemubamax.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/tumupeki.pdfIn PDF document text
    • http://recviem.ru/img/upload/xumosagujapoguvivip.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc26b95e1---walunulaxujotomofutasapa.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/17079926665.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c8285d1f---91926715644.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71cdac1ad1---95584589735.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/kuterivowipokobopifew.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/9921606536.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/0vdug6t1h5b3fa7473k82i49u1/68625664105.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7341b6a41---zetibopuragosela.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430110807342019.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043001063840.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/19900557786.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a050dd91caf---40847528109.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/75056306921.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3613719e---91137750948.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/19757229473.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bf2f5e3bf15c2d89f611b1381f1e1805/mosajo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4baee81ee945db5d3c7c418cf07e5b23/xunajibomesizozarove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+delete+speech+recognition+windows+10PDF 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_off000104b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 18276 bytes
SHA-256: 516fa7781a2dc4ed325e63fb7f17faf149e2132d14527346839acd39029800c1
font_01_sfnt_off0001355a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D71 10880 bytes
SHA-256: b273f70bf88e242f6af2539fa106ad446d2bd4ad0702fa3c89c5f4f9852271bb

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