Malicious PDF — malware analysis report

Static analysis result for SHA-256 804bf2f54f75a64d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 11:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 900fca46310f9d88cab677b1b1ff7c69 SHA-1: b6eb17b5b601be2189294f047c06242f9adc5968 SHA-256: 804bf2f54f75a64d73bfb61d27aaf6885d2d1a7d6632adc8e1c0feff1f01bde6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, likely intended to trick users into downloading malicious applications. The presence of multiple unknown URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/lisabimu.pdf In PDF document text
    • https://samsunyapi.com/userfiles/files/67270255772.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/9075095938.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138721fd6c24---89649702143.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/pizivuxetep.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bfcf3dc6c---wubojezosekat.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/bebalupuxebelanifigonigi.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/64210109891.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/zebagumuxidiwazomisek.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2f0c2d5a06c03f92708583347cd086fb/bazumuminofenajota.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nutumaxonasedaladavusem.pdfIn PDF document text
    • http://orem.mn/uploads/files/63189241180.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/namadox.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/sipite.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/82233061880.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131595fe62da---84900953847.pdfIn PDF document text
    • https://nexapos.com/upload/files/49948857243.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/77640600729.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/tusepeviterarerenubenokip.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904035349.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/60263198045.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161445340f086c---10363696406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fastlike+app+downloadPDF 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_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10440 bytes
SHA-256: 498ea43455a86eeb760f5faa80adae795bb110d16a23a2227f33eef35b3a482d
font_02_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 18328 bytes
SHA-256: 421e71a90fea5190fdfcfa171594d4bc545fc2a8db025501b473779c00cf83fd

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