Malicious PDF — malware analysis report

Static analysis result for SHA-256 252c6fb1ff273fb3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 02:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f13c0cbb4a4c02c73abcbc05c710fcd SHA-1: 1a10bc8b08a68ef3beeed93432fa6d0c1fa3c592 SHA-256: 252c6fb1ff273fb34fc487e6e859c637d09de62e2bd3cbee06fbd41e7f68e56e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the true destination. While no scripts were extracted, the structure and embedded URLs strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/70f79ad050cfc23c825b6aefd6681e04/41122944542.pdf In PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/52514487316.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4a2j6g0o5prdjiur7ehcu4sj54/vowijurutugulovun.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/bojuxaxujo.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/lilosefemuvitaja.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/dijadasaraj.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/kepajunajiruresokoke.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/gekavifawuxomiwusof.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/71485110754.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/gajuroxurexusirivuxuwi.pdfIn PDF document text
    • http://afro-safari.com/upload/files/kekegibumoxad.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/todafen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a14cea327---28250238686.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/8754295277.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903020721.pdfIn PDF document text
    • https://eetravel.net/file/59560164338.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7cba7b277---55820551007.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tirigimun.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/momiwufo.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/zusab.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf997babc---24717094586.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/wotujidik.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391cf06cfa5---ronuxatusofeli.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vejamalow.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/51771323839.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/11954184213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=play+store+app+download+comPDF link annotation
    • 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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 10784 bytes
SHA-256: 459653ce2dbe870f04a9711f16643284575480a63dc7ed4038f75e7eb4bca74c
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 17780 bytes
SHA-256: 19a4f5484b392286f252e53d5ae8dd7b009f73e14bf6e65714316cdbf88a1983

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