Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa5a4023c2b41bc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 07:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9bdcdfefda52570fd56761a097b8bd6 SHA-1: 4f8c1f7572a180d9c59745fbd24de6ae4803db0c SHA-256: bfa5a4023c2b41bc6b69bd0b3c648fee89bf2f2980de6781aae924af1689d2e6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate this is a link farm on disposable hosting, likely designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=unix+and+shell+programming+vtu+notes+pdf PDF link annotation
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/63901337113.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/83204793668.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zoxijufoxupobe.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/268c04e518bb6417090cc4c7565f61c9/naradiwexixus.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/sazigozasufetopujasirune.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/salorenexidazenepoka.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/22268995419.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e9aef5eedffc0028f83ff1f96a86ae9c/purabimegerib.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e859be1b---varuzalovipamu.pdfIn PDF document text
    • http://health-bridge.in/upload/file/55506719502.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/83009973865.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6359c56a631220354c13ecbe797d92a3/84884748802.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8lsna6sepeu1r89vhtd48jgdoa/dakigepidafomuzapusudi.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/1130958828.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/1nf38ckcslm0idi4882cvhoas5/bulomitekezabok.pdfIn PDF document text
    • http://cartopack.com/Images/file/ninetib.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/nuwuredijivakorulovor.pdfIn PDF document text
    • https://rcot.org/userfiles/file/77966695937.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8e486a1f---wikolenowav.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/vupupotakojabivimaxubopo.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/39685357415.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fi0nd5psm8be6pbcqsllh2ojau/dapulanirubez.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/13251938520.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_off0000c1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E2 18572 bytes
SHA-256: a5e4c5d422330a8569b80738d112c44d0236da0000b27af9d2f172a74f1e73db
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 11220 bytes
SHA-256: a2ca9fdda923732c8fbe8ac5e7ecfb677267fbdc63cc3466c7003744dd6e422f

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