Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4e2d0ca775901d…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 22:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fddbb59fdc1e25e784a4e7b5686350de SHA-1: 8b67eb7f2aa5fcfe24a72c7af0f542e141c499b6 SHA-256: 0b4e2d0ca775901d8639fcbbc541655de24caa7d611e9d4a4075100b1d6803f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may exploit PDF vulnerabilities or embed malicious JavaScript to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/918fab5deb0547be2f347d5335e266f6/pixatirolubegimufuvavo.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a91a112d661---janoregonifosesopivefe.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/52706659534.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/lizofojosopudapodej.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/suwopowi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/72830a8871f620a78834cc16643c939a/614072626.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/8f4203f4a4d5c22bd5f041d686663e8d/paxiwamobodejeg.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/63864764d7017b0d55d2ded489acf780/41477712686.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/12f1d1f120146261348248ec88a5fa40/disejonobiw.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/27034312238.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/68418812678.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/eb4e6a96ac35980b4ef239604dce32f1/lorukedulupiguwaxifuxat.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160869f22e84d2---tepulisipuwegudutejitaxid.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/39394588484.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/f1a35e3b9aa8b25fc6026c582d77841d/86994118310.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/21813612126.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/beb8e510b6e82edac53ae4e03abc5b1c/59381588143.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c3bd9fb3ab3e583765264a4e334487bc/maburezakiligasamovolu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607960dde7d8f---vanorowatidisipok.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/95482273655.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6f21013c---suxoruwifumapugojigobikeg.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/rotolesesim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=algebra+nation+section+10+answers+pdfPDF 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_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 18348 bytes
SHA-256: bebd37d720494075b0b6d38037364bff4629962d49959eab07be00394aa80ec7
font_01_sfnt_off000125c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 11176 bytes
SHA-256: 507ec2447d377c87e49adba2809139045861c829deb5dbb718494e46c9edf55d
font_02_sfnt_off00013fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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