Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfca92c063ccd592…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 18:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7b2a2a54aa0a9ee7a36d9f4a41b7d332 SHA-1: b27c33b26325fcf00b7b10d908359f5e56474fc1 SHA-256: bfca92c063ccd592a8b294f6d98bf9b6583a9baa49a633d76f55b3bd38e03782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is structured to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=download+lucky+patcher+for+android+no+root PDF link annotation
    • https://limsurempat.com/contents/files/9145852356.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/17930132699.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613940ebdbd67---sobomegokebed.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138fab05c737---92426383721.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/73089589778.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/joxanawakuxotoziwokig.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/jomegonukizarizotog.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/45000207443.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/39379738276.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/98320209776.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/jogagujazebekaxe.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202108311750466611.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/fipuxoposobomom.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/43645179050.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/3785403557.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/tivemepekesoxi.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/9034602643.pdfIn PDF document text
    • http://kag.fr/userfiles/file/25927899206.pdfIn PDF document text
    • http://xycrusher.com/d/files/laxokibiwepajifilazawexox.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/ragijisowoseta.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/q232clr5gn0ncc035ncrfbjjpn/fosefozererure.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/birigubisogokurunilutak.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916a04f778---jadukusuzusajeju.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/podumofe.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_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 10944 bytes
SHA-256: d4884c48b27469d3cc57c3c84242c487673a0e5cc2afb16e5ce1498120a362af
font_01_sfnt_off0000d011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 17664 bytes
SHA-256: 904bfac75cf9cd029d87ffec4c488ea06c1e119caf62a93fa50bc7277e210873
font_02_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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