Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a5aa0735c4f381…

MALICIOUS

PDF

86.5 KB Created: 2021-07-05 12:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a1dbec6e9e02f823a5b3929cfa5b3202 SHA-1: 7bec598c6d9a232af780127ac45397e6cbd54ac4 SHA-256: 85a5aa0735c4f3811690cdf07b5adff4765de48513984f51d46acd9b9f35834b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute malicious content or conduct phishing. The heuristics indicate a pattern of SEO manipulation and disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e708b641---55984562818.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0e8b626e7---bometoxazubu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0776c0fcd3---46678187144.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gj4h6i8andutjvhrsf5ia3f5b6/76065473123.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/sokerobalibakopesokazuze.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/35546382528.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/pejederesejitel.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/32642392079.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/350d2f64bc2d44f84698cd6a451bde51/56492449921.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/oo0v3i0fp4cl7ts4nf124mo758/zoxagodawojojenolenowituk.pdfIn PDF document text
    • http://come2menorca.com/images/file/xefegelinowogulikizopub.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/7938644861.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/dadulazunu.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/kotimuwolomijekaguli.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7868698b---64626791625.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/54766025172.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/gojelos.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b096083ed12---tusoxonedebatobodapuzim.pdfIn PDF document text
    • http://soles2walk.cz/data/file/nakokob.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8d10df6d---91422913820.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/9849d024357eb52efdfcb14dc829f1a1/kuluxunojiwezutezag.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/fusilokulad.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/dejosaxetepoxalibufavix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c54756f8---tesavikuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=in+the+night+kitchen+controversyPDF 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_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 16904 bytes
SHA-256: 88f2cfe3820a15b0ab2b01d0aaa5a784a25a1b3e5825ebec00ec6e0d6447a97c
font_01_sfnt_off00011c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 10524 bytes
SHA-256: 032f667c5e29ec3236c10864ab8d4c3261cbde436977e04d0e0c761465d32b08

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