Malicious PDF — malware analysis report

Static analysis result for SHA-256 6698fcd0ddb5fab4…

MALICIOUS

PDF

92.3 KB Created: 2021-09-17 02:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f02516095107450a416dba8c79d02890 SHA-1: 04c78054e2b5c6e6e9c12e16133acb4c7e9c71f6 SHA-256: 6698fcd0ddb5fab4368b3e0b6cefba27b0d74662cbbde396fc628b421a965dcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains or compromised WordPress sites, indicative of a link farm used for phishing or malware distribution. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://queure.ru/uplcv?utm_term=french+pronouns+pdf PDF link annotation
    • http://ambcavallon.eu/userfiles/files/83700862416.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/22225786168.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc11c4413a---64008968372.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/73398693017.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/kamufizutogulidomaro.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/51339814265.pdfIn PDF document text
    • http://school15-tyumen.ru/f/sazajovomaxedizu.pdfIn PDF document text
    • http://afslab.asia/upload/files/puziwu.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210907022141.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ea7daf7e32cae0e56652d11e1ea1bb14/99209469820.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/55925489197.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bdc72342deadb4610b4571602e820472/jotatigibaborovuwi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161417648cee58---19145725373.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/65744468790.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/96286173668.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/20511551922.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf9187148---vemupisofimerosadenod.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gubujaz.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/rizovaku.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/najegomuvikulitale.pdfIn PDF document text
    • http://netart.hu/userfiles/file/tatapibebalereniwidireko.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/mopalezupidutozikug.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b477b82f00---tetabe.pdfIn PDF document text
    • 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_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 10396 bytes
SHA-256: 67273fe25b776a1faf974789048886e73d35febcb51b75a0569289956d057c8a
font_02_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 19940 bytes
SHA-256: 35ca25ed68b66783a9d96e75762f459be2bc6f8501b67718702f4801ec6d4c0a

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