Malicious PDF — malware analysis report

Static analysis result for SHA-256 951a14d9b5b42dc6…

MALICIOUS

PDF

82.0 KB Created: 2021-06-25 15:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4e5e197215915f0638a0d46a31fd577 SHA-1: b0dbe2617c7e12f2da94f7f6748b895abf24f099 SHA-256: 951a14d9b5b42dc6bce192b24c18b5a3dde9b5e680504b4de5574b23eb5145b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2sp9b0cvo401j9oeoc3elacoh7/2446645811.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f98fdab4f0aee248b6cc69bc65e1622a/64931494427.pdf
    • http://cristal-in.fr/userfiles/file/timapovojituluwuzuzibop.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/bbfd3bb58452b0bcad9fe39f3461a337/97071230407.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607862b2a203d---wojifojib.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f5c8d9fd---54216669176.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff05f290d3---midenalimajebawasev.pdf
    • http://artside.org/data/temp/file/44948676335.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa95ac4d63a3632e4cdc1d0c55a7b453/sisilodafovigesuriwekefup.pdf
    • http://ultraljud.nu/bild/files/juzotewofe.pdf
    • http://kompletucetnictvi.cz/files/file/nejuzubakiri.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bffada41b0c---87181709543.pdf
    • http://cnmrobotics.com/files/files/wibobari.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/962014ab6d6a76f4d72b0b2f63723a54/lonesowebepemavot.pdf
    • http://loveperfectionschool.com/upload/file/vadiwutabonovom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lord+of+the+flies+crossword+puzzle
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e027.bin
20392bf94cd0ee3010ceb0db83b5d94d7b0a8f8afeaf157a4fd3ecf9859c09e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 16560 bytes
font_01_sfnt_off00010b01.bin
51eb203561c6e6a92972eab7417d46348752aca4af17f7e6482fdcf993e6c8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 10656 bytes
font_02_sfnt_off0001239c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 16792 bytes

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