Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba35cc2504a2072…

MALICIOUS

PDF

110.0 KB Created: 2021-09-12 17:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc73d847aff52c187bd99a524b5f1a98 SHA-1: 37c71b5cc68609a300667a2bed5b349a6b1829ff SHA-256: aba35cc2504a2072192005539f6ad253924b41aa6ff1c8fb3fc7b57eff42f769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://infrive.ru/uplcv?utm_term=pride+and+prejudice+novel+pdf PDF link annotation
    • http://khojedu.net/userfiles/file/69733732922.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/vemajevumelo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/bf5921c0598356a627129ef8eeceb1eb/lalifobusutupuromolipagan.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pigokije.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/12439802718.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24f2e1bfe---49041816369.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/nogigofivojobupewag.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/kapevivujavefutitina.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138100862d09---naginekigejeposikubalawu.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/katasonorepomebavodabaluk.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/27756193326.pdfIn PDF document text
    • https://salwangurugram.com/files/pepugogamipiwekufu.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/dudegenelaweje.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/risomofabexedexa.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/wuvobajisozopija.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/gagufakewi.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/55712911948.pdfIn PDF document text
    • http://safarang.com/basefile/files/nedujefapu.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/xumevotosonotivezafeto.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc944d5db6---jawopugotup.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210905230457.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/luzewuwulivomifojapazus.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/depowinorisefunojezokazo.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_off0001493d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493D 10644 bytes
SHA-256: 4d203f6ff6b74e7a70d3a4b65c689873ee3f9e078d4f5b7c612e5a3040cb3326
font_01_sfnt_off0001619d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000179af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AF 18692 bytes
SHA-256: fa59e35a457dea0dd220493977dfc0cf9fb23ecbe33d79739c52e36daa1172fe

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