Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29cd68d93f17aaf…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 21:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbf64a8a73fcb325105c49d5cbcfc783 SHA-1: 1f00a727402b501bced7443386bd77a1fc768c4e SHA-256: e29cd68d93f17aaf49205df0f43323876ed94bc3aec39cc3696f02b127c0155d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the presence of external URI heuristics and compromised CMS upload links points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://anabakorea.jp/userfiles/file/92556245052.pdf In PDF document text
    • https://rowsontw.com/shopadmin/upload/files/33955928050.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jelowogepazixegutukomabe.pdfIn PDF document text
    • http://ranchobg.com/img/file/fibevuveroxozaresifok.pdfIn PDF document text
    • http://szpk.hu/_user/file/vasonod.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a6cdf1b509---jarapawuloretokafakegosos.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/nukunobitebeluzasamaworub.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/66063988211.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/10348320300.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/mazizewewogilirasatokuro.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/ruzigosavofow.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/jisevowepumuxivurageli.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/16672733495.pdfIn macro / runtime command snippet
    • http://pol2-simf.ru/userfiles/file/80688040228.pdfIn macro / runtime command snippet
    • https://ceccargiurgiu.ro/userfiles/file/ribola.pdfIn PDF document text
    • http://premo.at/userfiles/file/96868072338.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/digokovova.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/89213989051.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7916c352---98740358328.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c190ec5553c4c2d37bacf4a186059082/sujomekedamo.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/sugipefuvuravi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142e67e9c059---88359192295.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161344b2e8921b---33834027153.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/56377311133.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/4670672218.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/98877488735.pdfIn PDF document text
    • http://bongoes62.dk/uIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+game+pspPDF 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_off0000c3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E1 10532 bytes
SHA-256: 1ec7d1c782f6e8b711bf1f9069a7fc1b89bad7d319a7052285b7f973429da73c
font_01_sfnt_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16728 bytes
SHA-256: 48ed6b5622639bf0dff8e8589becf25cc9ff2322487865013d6c1b06b15d58e8

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