Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b829d3a1a7462ca…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 01:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6de114ee117f3071f1d1fd64b0bb3120 SHA-1: fd52bea2a72ebaab6fe8277bac423e57ac5abf1b SHA-256: 7b829d3a1a7462caa579d7e33e38493520e408e9177875ede157952d3b4edfc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users through compromised WordPress uploads and disposable domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this PDF is designed to lure victims to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=brother+in+arms+1+apk PDF link annotation
    • http://zhizhencn.com/filespath/files/20210908165839.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e12204721e---99410248918.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b92bee010---54191092491.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/7124747148.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/fosixijibiz.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/14385372457.pdfIn PDF document text
    • https://eclearusa.com/images/file/sudubamamowixobesoko.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/totaje.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/38499706192.pdfIn PDF document text
    • http://sswjeans.com/files/39227435127.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/64823066288.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/wamexaremupekujufima.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/88566581617.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/80146980414.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/466213546.pdfIn PDF document text
    • http://aquatherm-graz.at/files/zozepotux.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/44543836894.pdfIn PDF document text
    • http://farmina.ru/uploads/files/53373310380.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8fea1ee6---63098075153.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/vumademin.pdfIn PDF document text
    • https://cartolmania.it/file/xoxamiridapikapofilanoga.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/dodekowuxazolex.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/91948525823.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/95390612712.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/10952341079.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_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 16608 bytes
SHA-256: 9c8a98852b81da9b76b020d577e3c42aa28e6366d23fa9a42376b52d6ba3298d
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 10668 bytes
SHA-256: cd85f990051bc3c667d1d636f72bf53bad987b8a288c6e1627a633c26bfa7a59

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