Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1dc2b7e0cc202c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 21:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e271413c8425e2007ec2cef1dc53336 SHA-1: cb75953352f8e38f1267e1bc6d44479a145f8f7e SHA-256: da1dc2b7e0cc202cbc6f40d64202dbb2f247dfe2f2f70e94c2cadb4ae19ea2e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/93226451063.pdf In PDF document text
    • http://batiment-tunisie.com/userfiles/file/65257800018.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb4ce320cf---zaputuwotegapiro.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/54403327893.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/39643740207.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/gorobufusevufaxowozifutus.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/japalub.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/amptrra8rsqs9452vahm9ec204/19895936904.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a3ca422b---13391696534.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/xeboma.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730fa831d79---kurivasufuxupile.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/jarukudulelidin.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/lodobuxolexebiwinidufez.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/fomotu.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/68707906793.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/jvdf6rlad26ei222t3dr2u7809/60752464434.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8eb3e80e5---rajojolisofati.pdfIn PDF document text
    • http://manu-transport.com/documents/file/97189390157.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/eqfb745f07nv9m5gmjrt5dah34/38021104442.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/76413519071.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/45hrckfq2hj9oilfgvdn1cp30t/1090380151.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/29364365724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=subject+and+predicate+activities+pdfPDF 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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 18056 bytes
SHA-256: 25fc27ea482e08eeb5024e935db02ae1be22678c59d209f54e1a21a283ae34f5
font_01_sfnt_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 10960 bytes
SHA-256: a75cb3917288eb3acb029cf1b701067d44a8f85e99d89848dc6cc1edb4451246
font_02_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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