Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04fc18771821bd9…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 12:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ae57ab8d99605393d3a2cd09bea47b7 SHA-1: 28570ad09780cd44d0be6c8ad272257590d2559f SHA-256: c04fc18771821bd98bbda1a1e22a3d1cc6a2caf729128d609ddaf22f7b836b8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=androids+apps+on+pc PDF link annotation
    • http://cegled.varosom.hu/userfiles/files/xaxijidugegojujemiguxi.pdfIn PDF document text
    • http://hongdacable.com/d/files/34892487545.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a319524866---waxarejulezosuzof.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/ralugizosuwatebaj.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/52673726241.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/80896800502.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/ximujogukagoju.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/81075810319.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109140410405228.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf2435238---xativapotegabatonul.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/3506574060.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/jubidosibebuw.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/fevof.pdfIn PDF document text
    • http://honda-vo.com/upload/file/wizam.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/kilirugexovosizoxibogij.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/sataxezuvobejetalazixow.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/judofivufubivaxul.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/30277543097.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/bokeririfebeluxinewipo.pdfIn PDF document text
    • http://space-edge.com/upload/files/wofujosago.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/munirawutejoruzop.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae6526793---norowadejaju.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/lixozirapivek.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/sobuxof.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_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 17328 bytes
SHA-256: 5110d26ba92fd76e34ac87fd0db417ffcf63571f76f34ce622cb55cb6e2b2ce3
font_01_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 10212 bytes
SHA-256: c42ec6fe57c5e7cc9da5e02b07d4d0dd172e0cdbdf2c98d488bd884efc207aca
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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