Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0d81c23f82a6c6…

MALICIOUS

PDF

74.7 KB Created: 2021-06-12 19:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 71bcd664e71bc2e3b2856887e914adc9 SHA-1: c00fb5eb2e769412fb5a27b65272c10b2e8fc2b3 SHA-256: 5b0d81c23f82a6c6acd7dfe9b4977b16a517a75cecc2fb7e67c76440d96b8dd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a link farm pointing to various domains, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malware or phish for credentials. The primary lure appears to be offering cracked software downloads, as indicated by the URL parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=adobe+photoshop+cracked+download+for+pc PDF link annotation
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/edd73c0cc59e710cdc22f216d7ab3ee6/kiwimogatenisopipigefaz.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4f91c0a0d9a9ec91bfa99befbf4b05d8/61371668393.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608923f1e1523---71022309152.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/512c479c03085030c927b1d06042541a/16094091778.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/92988574080.pdfIn PDF document text
    • https://carlojans.com/cms/file/28096918840.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/70752553173.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/009d54dd26b055421eb7192f5b199b6a/84978042429.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/71261573578.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/52cvc9q9eep1noa1elgipel23f/33275200167.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/42095191083.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/14132755402.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/98555011998.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nurifaputojejufu.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/didowakasowelen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 5528 bytes
SHA-256: aa8be2eb9727143e5d635c4122088f7385ca197f9607f769729623f293d75e25
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 10328 bytes
SHA-256: 76cc9806898c7012a2b9dd24c1bdcc43032f89bbba70f6e44e1ff5c3e2f854d6

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