Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b107a22f4b715d…

MALICIOUS

PDF

82.9 KB Created: 2021-08-23 12:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0d9043d283d4cc3347e41e8a13af663 SHA-1: d2f2350ea463bdc1fcb4d11e1d0942edf0ceb0c0 SHA-256: 08b107a22f4b715df564a23ceea1f507d9d7b53debe2e7d18aa715d32f4fa950
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the heuristics strongly indicate a link farm designed to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee8fd4f91b---sasepora.pdf In PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/tq3e5pml4g7loag224h7qc8bdu/94668393737.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e4c2e551---jitipakul.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f464f11c---goramerapivuxudolifunuk.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416871f287---47121329704.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b87353d9e43---tokoboxe.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/62695793130.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/80659429643.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/99951367250.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dfa9ef59---nolupig.pdfIn PDF document text
    • http://slsnn.ru/content/file/xumudisosafor.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c3a69066e---11681368223.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/lirewumojizipedegatu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612003477f2eb---61191650631.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a17aa18d5---kudikakeg.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/nilikiwapazo.pdfIn PDF document text
    • http://stattus.com/assets/file/laveboruxa.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161216ab40d06e---vagofe.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/62759324410.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/9497897495.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/towexerowelixej.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/jelasevedilomubutava.pdfIn PDF document text
    • https://kawanmto.com/contents//files/37657674611.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff03af29c5c---78327066499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wasp+with+white+facePDF 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_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 10284 bytes
SHA-256: b8b8492821e0d455f2358c49a07d24b0ac131e5b17dd9a37c59c34ab85b5576a
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 16820 bytes
SHA-256: bf0d603c6581dc710b895e3040364431007b41ec49dfbbba4b4600569144e0f6

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