Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad844b3551134636…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 00:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d910cf58cb2123667f35e7ca4afce4c SHA-1: 42bccc0a746155d4cccba43dcadfdb6bad1dda53 SHA-256: ad844b3551134636fb4faf7e7229059cb0796523509f2eb6b31bb6185d9b2c61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document acting as a link farm, embedding external URIs and pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a83b036ee---57219873090.pdf In PDF document text
    • http://computer-rudolstadt.de/upload/file/30574535123.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/71157257058.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/21201878226.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/hs4as7e42r6n2i9m2vam8gmhn1/sonijo.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/75428840671.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/vetawasafufapotorejabop.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/75970376381.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/77174008130.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/33176619351.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/51807013909.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/795cb4qn3cjhhh45702rl60kj0/girofadibulibulu.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/11828618346.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/69085307876.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094737d32597---32525546681.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/nawajisalojefopusikunoziv.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/dojiremujemari.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8k1dot17pcr8fin3ffaemu93t2/11922300464.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407968c16d---22601859492.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/23450172757.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865d77e6fd6---dituku.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/6101816207.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6102e5ce71181842cacf653ade924d88/94301893262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wishes+and+regrets+exercises+with+answers+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_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 19296 bytes
SHA-256: 5b9648bd86d462e0a1ea881479c11e129997b8de184b1ffd40b9c13b2de5566b
font_01_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 10916 bytes
SHA-256: d3ebd0cd158208c69ab294268a4fb22d69c421ba744172d2692a0735c508f5cc

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