Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3aed579322fee0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 01:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d68036b8a30f0098b245a76938630ac SHA-1: 2188774e01ffe324bc404f61507ae94d00fa91ec SHA-256: ba3aed579322fee0bdb55a9bda4fc024b94208e548cc5f3828d78a911dd0b8c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of luring users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=cutepdf+writer+for+windows+10+64+bit PDF link annotation
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c12df0aab---buvamemuloremogisopir.pdfIn PDF document text
    • http://esistore.de/userfiles/file/83838405387.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3af04fd00---57007342211.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/begufopim.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/62646912940.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/potavaliropow.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607593c81cb19---87970759725.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sglonun5h1s7hhs1iifajuhvbu/vanilolirataderoz.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021841828513290.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/2073255577.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091df7cce7cd---40550066264.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/gakakurinuna.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3e3657d4---93631222964.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/tesuvunez.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/nireriberafitilumebixa.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/91937225851.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52e22cf21cd75fec8544eecb124937fb/delodelojosiditokonig.pdfIn PDF document text
    • http://df-foundry.net/d/files/vafikusogidijananapujatu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/natolitomu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/72168083784.pdfIn PDF document text
    • http://lse.hu/userfiles/file/tokegobizejatosulidovo.pdfIn PDF document text
    • http://i-dron.cz/data/file/8154333280.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/56064236155.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/11990486028.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7df0bfa663ad5dff88afb6f4dc317781/gagoxiwulodi.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/94425478290.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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 17972 bytes
SHA-256: 0e78b5a84cdb1c37893878c81097532722aadd1ebe5b22903d389b9b85549218
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 11060 bytes
SHA-256: d0493b6753123e4fdae9a1922643de42dce61823b4f48dacab430a4b7c0999a8

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