Malicious PDF — malware analysis report

Static analysis result for SHA-256 3941efcf0ce09080…

MALICIOUS

PDF

73.6 KB Created: 2021-07-29 12:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9f679d1dc9e266408854d233215f6e0 SHA-1: 063a2c4c387c77a008ac4685f80fbfb306f47e6d SHA-256: 3941efcf0ce090804ff972037e0f9dee74bab509d1db0bf854f5f7e1583cbce7
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. These links are likely intended to redirect users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd40348f0da---ziwututije.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/t0gihptno3s2chcnr5ic7gob3v/kodazipatomivufe.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/zidajunaxux.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c039de55e0acd16ca1b2f27c721fd5bb/97877083441.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/50809468020.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9cb2a94c---81237023723.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f96192ec25bd66600ff71cd5ae9c798f/63072005132.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a9d98fc8---tebuxigewulofafixibe.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/kms4jm2iajlsltl2hmjr2mvjj0/12973552917.pdfIn PDF document text
    • http://topstec.com/d/files/22687520675.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107281658034219.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/84310009971.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/36788242414.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a390ac0b---nuxavebolepoforosuvag.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zalusutawimoruz.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a86a776c---gumegoxizonafepixunulo.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/39188192216.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/918c56d8a004f38dec4e6853f19197a0/vusubomemisuxorime.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j6p6re0co4s4a7nrdnnnocaa66/81165663911.pdfIn PDF document text
    • https://hsse.cl/files/73049819053.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kesogozanulotepivawupabon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sciatica+exercises+pdf+orthoinfoPDF 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_off0000c0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FD 15268 bytes
SHA-256: 1ce1fcd50fae463948b9d269e2aaf4d8b24737a270167b0cae9167bc27b699b4
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10848 bytes
SHA-256: 1c7dca6704d420052892d1de924326a53547d354e0696459c30e70cf37feddd8

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