Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf5df176f71bd5d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 16:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11cf24b51c84174997494762c29b87d5 SHA-1: 0ce9ec89b76edbaa3a765956988aa4f6a8b278ee SHA-256: 7bf5df176f71bd5dc00adf77ec5053041dec984baef6dc3935fbea69f4d0fc46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it's part of a link farm or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://euchebnici.com/img/file/safumopawajopurimen.pdf In PDF document text
    • https://dacola.com/upload/files/mivulozorax.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9dd4c43ca2a8c0e147948e7fb2969a95/kejodapizobobip.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/41948165279.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/libokagazobamifiwe.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/46413182013.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/95294240059.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1adffc7beb---84074052124.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/26898222965.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aff860ac598---kexixutu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/58e17f6b2b0c47fdf0e510a8838e45d6/74489294069.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2f2811ab---kebugorufafiluzonape.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/zubivixe.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f947d5343f---xuselozuparadaj.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8efe9948---54536518589.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/50344593472.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609454d69831d---ribunagaketu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeda967c01---tonuluketaxegar.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/boxugitapijegevufuwi.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/bitugiruwoxamow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=multiplying+exponents+with+same+base+worksheet+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_off0000bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 11572 bytes
SHA-256: 1a1aae966b3a64361e76c22e1ae34d651846fe520651874b1ebab55c1ba630f9
font_02_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 16420 bytes
SHA-256: a821b8fc58f222c6e121b2eed809ab21999a44f82b88b96099c8fe7ce1d4bf32

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