Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1f3951516f6b96…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 13:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd2c4c5412585f1b967d99aa1a7d094c SHA-1: e66c908fe1046b57405272eb2997ff47fc42a5a4 SHA-256: 1f1f3951516f6b96ac02743810e57b95a1581003698a928c73066692b975435a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs suggest an attempt to redirect users to external, malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://sequirk.ie/userfiles/file/kekonudofavatederoduzipux.pdf In PDF document text
    • http://ondrejkocar.cz/img/file/zejofowagiv.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/7304729849.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba311bc838b---botanimevevak.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/45062409092.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1nc9sj2l7rba7ssjbrqrr6mgo4/sabos.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/vimijawotipira.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/91550641310.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e284a0c7---2736641762.pdfIn PDF document text
    • https://inncredel.com/uploads/40994019122.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/94027340cb5a811d6068f5258af3d5bd/57138204995.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160deb8b30251d---lepegadubonexokurutizos.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/63561690417.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2406720121---22257179742.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/busomurifi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/munazulikabofaj.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/matofuloresaserowik.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/monuwuwifubetoxofaxob.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e5f444bf5---nujosebomeg.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/lda2dj7vjkk4ud12ish7pm3b41/kevupinusijako.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/ridufogavuzikezazuliji.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/10627717648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=venn+diagram+pdf+fillablePDF 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_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 10564 bytes
SHA-256: ce3134f90abb39119db3ba64dde2c189bd33e949e382cabb472bd0cfaa18c08a
font_02_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 16388 bytes
SHA-256: 5b0e9a0b5ea8c6cab66aa319293c723e582f7dd5517a91eb1349b92ba15817fc

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