Malicious PDF — malware analysis report

Static analysis result for SHA-256 517d5f54c6aa41ca…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 06:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4921c218def84bff8e9273c81f6fc633 SHA-1: 68c757c665084462a16d7b08ed6caa366ac334d8 SHA-256: 517d5f54c6aa41ca13a36096d950529e9b5d5f8a8b1604611c5de0eccf75ea58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=convert+excel+into+pdf+free+online PDF link annotation
    • https://dolmalatrek.com/userfiles/file/58410659150.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/62856197415.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/19795856388.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/91e24624elu6anufk2upsg8f7j/dinarilowepupejogadamavij.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/16225438485.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/46052499116.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/34072547987.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/bijolizipapesipewapituje.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/befba43826bb2b64a0f402c5e8a3051c/58414332217.pdfIn PDF document text
    • https://halkum.rs/files/90295146205.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/96559614320.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/72118614529.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/6df80bbd1e3113af084ad8bc24a117d6/55656410967.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/71b7e959fae9231ca9459270e3185704/migofivutupazesi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f05678f3---45352687268.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/rosiguxupexelam.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608539d11b52c---89923186829.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da3429bfdf0---5412693846.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28592d9928---bezelomo.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/bunekesewudelapix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a464ac2d6---jewejogezazavar.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a602110b1f8---jikenibonolibegipidevir.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/kupojurexepofakiluvuxuno.pdfIn PDF document text
    • https://robertbah.si/files/file/18428589952.pdfIn PDF document text
    • https://lecapsuledigian.it/file/31224344348.pdfIn PDF document text
    • 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_off0000c71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71D 17724 bytes
SHA-256: fa01c5a9a358f0ad56c576239df394119fa974ed65b9c5ff6ff556a86b5cc8b7
font_01_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 10484 bytes
SHA-256: 25659a82aff445617d48dd689b96e674a0c4e5cf094db81367a32786252c5e7b

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