Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e421b53adcf331d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-21 17:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e5e921c2917aac4625e2050de766bb2 SHA-1: f392931c729f7bfdf87f111f71b2370a64762b24 SHA-256: 9e421b53adcf331d33c0adeacf424609074a2b5429c8a3799d8b37c1d44b2535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to a phishing page or to download a secondary payload.

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 http://zanethompson.com/userfiles/file/kosorekeg.pdf In PDF document text
    • https://abofahed.com/userfiles/file/wuxedufevubikudotafonoge.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/lutuwipurudaje.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630809177963262803.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/94900173955.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/pajotemafowobuwulugusuw.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/326c844e34541b6167837cfb886b5393/12364123599.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/13559982491.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/50821879190.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/38724406842.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/27218600743.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/23602589922.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/zekejusemozofinakum.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0401496001630886533.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/29064445212.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/52009646522.pdfIn PDF document text
    • https://penal-garazh.ru/files/revopufa.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/66516689014.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/33177150347.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ris75bdeddmaorjdcg0kh5tqd4/24849042711.pdfIn PDF document text
    • http://pk.mo/userfiles/file/106645129.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf7339ff8---kaluvidoxenaxupovagu.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/liseluvitita.pdfIn PDF document text
    • http://slsnn.ru/content/file/tedigufusepope.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210919_190713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=slim+led+tv+32+inch+price+in+pakistanPDF 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_off0000b66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66E 15976 bytes
SHA-256: dbad7a9ed4e038e56ad489499e546a0d31a1d06c34abc275b4ab2dd57fd779f5
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 11184 bytes
SHA-256: e44eb99e8ef1d63cfada9b270c0b3dd6c161cbb715314cee2336f719106cf47f

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