Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bfa5dfe9ee78f0…

MALICIOUS

PDF

85.2 KB Created: 2021-07-19 02:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 36f896b473c04b0b80d28042bdd2dae6 SHA-1: a7d17bc9afbba9ba363204c0e7bd98028e977de2 SHA-256: 39bfa5dfe9ee78f0bb529fb1cc304f75e0592cac65a1ac48a4e29e15d898b047
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lead the user to a malicious site, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://annekienlen.fr/imagesfile/87713033681.pdf In PDF document text
    • http://amphorabeautyclub.com/campannas/file/59885161091.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/8621840864.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/721f0ca6e4fc9d8c353e0b1d1d6d10f6/26738062941.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef15caf28---21215042731.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/lurigurefobupa.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///46945341435.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/28646463890.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49d54dd1b---74193224821.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8a143e326da7875fce13b30a5428154a/zetip.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/63b0ed5e391496f70020296f4792ddd7/55150701555.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3d5o2l6hitsgteh068e4shnsir/89703985752.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7d66ec0a---30065024115.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/1rkuupu13u6jf39t55rqq185o7/91194716163.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/zuxadorolizexiwapipakife.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/manarawukaxusizewadojo.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/54089880093.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/81951347298.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/2tqvtj9f3g31ti9735hmn8tbo1/ralazifalo.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/lizavebenabafikor.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/bc2939df2b9cc7d0ba149b4a0619ba19/pipetugojakeduwabuzavexub.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea760837c---labepop.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/585afd48afb8e9ee208abc07a8d63d53/datomedadozekobirixozop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=south+african+mutation+vaccinePDF 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_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 10628 bytes
SHA-256: d82a9c026e8bb03e2d22ed862cbf5b1e1ccd6871943423b307e6281262be7ca6
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16480 bytes
SHA-256: be995bef4183c7314152945acddd3b9e4a5a489cfe98cae6c06d4348a2c190c9
font_02_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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