Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9453527814afd86…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 14:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cda24a9830b3ffef156539e72cc8d0c SHA-1: 2c961af2163a4eeb9a7efc8f25a55868ff3a112e SHA-256: b9453527814afd861bb6d07b989b59f8e6c73c901e5e9680328a192952514260
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ehlibeytalimleri.com/resimler/files/3759907646.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3caeca12bf---zabedinako.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160815ce9a5a44---19292818943.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/049459e3e39ba8f0b71a4c228dbb8c85/daxokareledefefijidezuva.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/a4152bc20d95b8785575c319e877cf21/pones.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/jifuvovenalal.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b279dc31a9---12756434002.pdfPDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/812256c8c376fd1df50e366a64f7b4cf/31885495536.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/ganinitax.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/vidodekelu.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pikosidopamijiv.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/40115746446.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/06d8d7d1a64ac743d5351c87761cd847/41556428931.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/14ff2658693fb207a6053f6f0cbe1cfd/97575215566.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/dulofemexu.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/60785337878.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/76068182762.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/navilas.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084d506d4b34---32134578097.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/142048591c301d2b9d55d9687110a4aa/54008839522.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076322dd1326---96151941797.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/bilupavinopetuzof.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/16067710935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=translations+functions+worksheetPDF link annotation
    • 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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 17920 bytes
SHA-256: 374a5a522707d5280869a6edc769e1c9f3f2f9dc85a6296c9ad9b2dd2a45ba5d
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 10676 bytes
SHA-256: 6155f137827fab800c91905c151218c1b0554c2593823bb59e0f286b918cf586
font_02_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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