Malicious PDF — malware analysis report

Static analysis result for SHA-256 88354f8bd21619da…

MALICIOUS

PDF

80.3 KB Created: 2021-07-15 22:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 00e6e246c45e4ed65e719ac38a7d2d30 SHA-1: a0597978743465643f4f9464468eb6d1fabf51ac SHA-256: 88354f8bd21619daf7b23f4dcbfc81556a2cf6bcd4a208f22f1a033211c88081
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and heuristic firings strongly suggest it's part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://polyalpan.hu/_user/file/69057323920.pdf In PDF document text
    • http://chroscina.com/userfiles/file/84689136449.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160846979e1280---63787599078.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5d04536aeb340d139eafd14d16f6e4a7/99563432837.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/mimezi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd7f485de---32759171706.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ca817bccc2a718b9bf7f1a3486f03a63/noxafoputosubumasiviful.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/revipu.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09901521a---vigotikibebubidufagepa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd712e46be---88405701517.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/78767333103.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/4a7ab90b4f5db9217f96d6c20546ac96/93528981841.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868235a995---98635451248.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8591c245---21408984008.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9kqp0t2eppcef4ve2imus57fkc/vilivanebumuzoxumatexo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ad21150---91803956099.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/jimoguwogitogisodamixatu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/9416761943.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xevexovawisobufitetafewid.pdfIn PDF document text
    • https://saam.vn/images/content/file/jovanubatojoxapi.pdfIn PDF document text
    • http://apvn.info/userfiles/file/87535418344.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/41301e4f83eeed3bf52d0802589f3fc9/taguvitujodufarolituf.pdfIn PDF document text
    • http://orderkai.com/uploads/files/28871472988.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/xijisalimorubume.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/diminasinebufaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=everglades+k+12+geometry+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 15816 bytes
SHA-256: 1eae30a8cb6dc9f10fc731dc7d0d1bb935fc3ee6ff7c2e3064f98b93597fdf5e
font_01_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 11012 bytes
SHA-256: 5070e487200fae815965fc68b0c2db69b27d31e0ef95ee46d9dc7dca86c95d48
font_03_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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