Malicious PDF — malware analysis report

Static analysis result for SHA-256 055ae613e0ab61c5…

MALICIOUS

PDF

83.3 KB Created: 2021-07-03 09:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 89a4a5258b60fcb921ec6755e91bd09c SHA-1: 02e9f7379053f46327d14a38185115a61646fbd0 SHA-256: 055ae613e0ab61c5cb565938c1d76d34f197951af49a57e60fb86677f5d179a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=geological+time+scale+notes+pdf PDF link annotation
    • http://dptour.net/bot/ckfinder/uf/files/nuxegakuvumisuvumaki.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/sumunisa.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/62466985032.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/nejovenojuzetux.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/nuvug.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be10eb7828---41625061253.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5403c92435---25967105565.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/gavavozabigewezagawor.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c76e3ee57ec9876963756a4c597180cf/mugevazimoxis.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bapexovexijinepitu.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/noxasitakuteligevawerab.pdfIn PDF document text
    • http://www.emailposte.com/pictures/samubu.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/jigojofoseture.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/minowoxifojipinij.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160718b11e3d04---54963926263.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/25979243805.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/b0v9vhv23n31b7k8t3l96sn0vg/xonuvubepobawi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/27738125712.pdfIn PDF document text
    • https://sambelteri.com/contents//files/71839500840.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c774e491---95025273404.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89df4d62b7---82651715537.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 17072 bytes
SHA-256: 6f3888f4e077af58f5502e0b1073d644e1a0756963ffb8f48550c2e7bbf65d62
font_01_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12578 10900 bytes
SHA-256: 27422654f77e67abf6b2aa3716910a6aba07228f307a9e416f867c92bda37423

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