Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb33fc4989c1d10c…

MALICIOUS

PDF

83.4 KB Created: 2021-08-13 15:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7f50bcae5593530082277213cfc0a43 SHA-1: 67815b24bb533d3fb71c3c0b7e3b2ecb5c614a66 SHA-256: bb33fc4989c1d10c1d17314a922e9e35c98da23638fc61f5e1d74ff60a632be7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of a 'password-protected archive lure' heuristic indicates the document likely instructs the user to download an archive, which would require a password provided within the document itself, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=a+nightmare+on+elm+street+%281984+dual+audio+480p+download%29 PDF link annotation
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fdp276qgef2n976thuig0mav1v/vugitemawowusarodinuke.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4dae2ee40b34860751f1ffaac9a98dee/78095837977.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/94771445533.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/gatuwe.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/67841384056.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7098a6b865---netumaru.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8fb583d4db7fcb8f2b7bebc9c5031b57/4016055571.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4753cbe65773a5004b6a7b1a17b9a75e/jokogojutivaladotiseb.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/aebfcf2ce61d66f0f2c42be85d806d9d/75539881596.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/49a194456d689c81005d220787de4121/subagojoraxaxoxotisirom.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/15119866692.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4f873b47481f77f4e86da184726a1b8b/16504148748.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982313118a0---pifugojabevemi.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/10140133716.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/72447252746.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zeworesipulepubesosapume.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/68855384775.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b46242e4a5f---93962124367.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a417d84e9bb27924a3eda2efa5d46b00/fopolifetimifizubanodofuz.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/sumis.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9741f5b9---gokapobadomumi.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/51418843348.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/luden.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/acefa748ebecd73a13b2f4c7b71bd28c/xisizedi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a2607e4c3ef---xunusovoragukuter.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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 11792 bytes
SHA-256: fd38d64152fc51d650ac2a54549dfc2db4a0c85f2c5ca662f0016ff72e68556e
font_01_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 18988 bytes
SHA-256: 906bd52d955371422e3a9ddf49c7f4e89f472208345085786936bc15faca2df3
font_02_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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