Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4334896af5d1e83…

MALICIOUS

PDF

83.8 KB Created: 2021-08-30 17:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abde7a4f1615816c79145e12844e58af SHA-1: b8690555bc1c6a945ce6bc5374bda98b7a2d5444 SHA-256: b4334896af5d1e8369a1e42cbc4d2fe900910f533d05fede968c710185a72fb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://portalcom-b2b.es/img/user///file/_0737167001623981522.pdf In PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/48146453140.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/91436662460.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/tobizogasome.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/pemupagekosi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a279303c47---22977634390.pdfIn PDF document text
    • https://airshow-bg.com/file/74443483116.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/bokeki.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0f421db1e3b86ade6fe1bd2f036c1338/pexawafigukesedelupapulol.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4af048be9b787daac6c2cf4560a0cf21/44728201268.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/520a0da13cfbd0ce376738cfa6c25b9e.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/gotim.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0731df201---raguxuxosagovusefi.pdfIn PDF document text
    • http://beiks.info/public/file/togixorofusovinegojogon.pdfIn PDF document text
    • http://brukbet.com/user_images/file/65805561639.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/gutebazakebasog.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/28fb9ef3614c2f3b0df58f4fb8a454c6/8587835031.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be8aa4b6aba---dagivapa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/825f811ce553fa1576ad307fe9edd844/16783278174.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/20vpgg3ad0ad5fq46iaklcc1tm/dorutuzogarodozofax.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/xupirazitabufewo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210726145852774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=is+loves+a+verbPDF 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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 17720 bytes
SHA-256: 8f7513aa3282fe47baf552837bd51500ab4d24efdcec59effe85f3e509fe4353
font_01_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 9964 bytes
SHA-256: 5b399c9fca782ff4aaeb7798ef0a08e85f612699126f7b836e3c6dc48e1bbb18
font_02_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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