Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba61107cabb7e42f…

MALICIOUS

PDF

87.5 KB Created: 2021-07-04 02:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d09160feabc291287bcce7c5d2634d7e SHA-1: 5e6a322f4885177ad5c104746c5d521d1a25d6f9 SHA-256: ba61107cabb7e42ff0084bb04472db35ee625b6490d5f4483dd1f1478e3191fe
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce86d1fa0---75039584002.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/209f11504359c06ef27da33884b2d41a/86893378403.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8a9140ba---rarogososaparijenomejud.pdf
    • http://auto-spec.ca/fck/file/xered.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bd20fb05449c7dc9a3bf95754dbbc444/41585796556.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2tkdcc9cga5eulsms6j81anmp0/wuvaw.pdf
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/senuzesovemofazefigafem.pdf
    • https://aldapa.eus/files/galeria/files/53705297705.pdf
    • http://abacusnancy.com/userfiles/file/94131883502.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8eede5382fde840abd6bbc68b87c508e/migejulel.pdf
    • http://faradbox.pl/files/file/39483332982.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/990c5b7e7c5eb30d6eb770072e6f4c22/bifovodaropusokagorukef.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/crm3etmb7lvkm52c9nku47ivpo/sadakemiviwiwurukep.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c89155547---bepixesipuburipajusud.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f824fdb7a2---lawel.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07790251a2---domofolinegixezebaxilojop.pdf
    • https://eventspicer.com/ckfinder/userfiles/files/daxerewiwovufewigumojesa.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/12966aa86e585f8d6ea861f79073b02c/fumijenenobi.pdf
    • http://vector-mebel.ru/uploads/files/89944065472.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609490d0d3e8f---pikanef.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2468611df1---zedekorofuw.pdf
    • https://x-software.cz/data/file/pepopatagizaga.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/7716400312.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/h8qjtq0vtapond56roaumfo906/30432524287.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=world%27s+first+transcontinental+railroad
    • 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_off0000f10d.bin
5d113f3bd222057e99ca5bb00f0072b06eab58db28e12edb2943d447c6377421
pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 10496 bytes
font_01_sfnt_off00010911.bin
a440974ecf57017af424997f6f3d7c9a3fe896a0e428eada243f9258a105445a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 17544 bytes
font_02_sfnt_off0001369b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 16792 bytes