Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19a41163a625085…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 18:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02ecb65a332afa16ae74be8db5a275ea SHA-1: dc75bc2ad46a407e98f91783ef24674f262f1f9c SHA-256: f19a41163a6250854d69f9301e9d5cf13247a9c6e74a4527533a4f284b661c31
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://neoneofytou.com/ckfinder/userfiles/files/64498609042.pdf In PDF document text
    • http://hkbroadwin.com/userfiles/ziniwajivabovelideronana.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/7693401636.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/tugonebaw.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/notidezakenolefubisesum.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/32204539616.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/kararoneretofobazupu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/90b864f614b8ae4310016efe3bac52da/34586563124.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8889e704b---79466305167.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/nafen.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/61181701075.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/mimuzeke.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/57620411958.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/woruvosegapedigotupis.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/lisabemivevogenuxadudazo.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/muwelupobabirixarezur.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/giximefudilekafapex.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/pariwubuzugavuse.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d57c7f25b7d9cb4aa6c04e0db3e7acb7/lomadizerafu.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/sadigajusofakenekik.pdfIn PDF document text
    • http://mobiliteit.nu/files/jofona.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/xuxodepufazodizotozulo.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/71991417855.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/romer.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/rosapadakuweb.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/doxomakigemimexewuzuduwog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=listfiles+returns+null+androidPDF 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_off0000bcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB8 10404 bytes
SHA-256: 574f77d91d49d5b668462d5fedf6c32780b674034db294434544fb054f3c5242
font_01_sfnt_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 21056 bytes
SHA-256: 1a6eb63fa054ce36667bd0931111d41d2821b483d6ad9a1b958e004a359232a0
font_02_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a

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