Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fc18595037501a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-28 01:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f59626491b21fcf7091a855338451ba4 SHA-1: 9f6872d590b79ffb3fceff1f192590ec23a654f8 SHA-256: 95fc18595037501a9cd23b2a80cc0622867347ca335b30370dd333f7e6c89454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised or disposable domains, designed to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into visiting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=retrieve+deleted+pictures+on+android
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/asr31d80q45q1hnb3n6n7a52d1/8684531600.pdf
    • http://lammermoor.net/imagenes/file/27328626237.pdf
    • https://exlite.it/ckfinder/userfiles/files/13168973065.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac7321594---91653776977.pdf
    • http://aircond.md/upload_fck/file/nazefefavinizopifa.pdf
    • http://www.pattyn360.com/upload/forum/files/wojugeg.pdf
    • http://liavanhaeringen.nl/userfiles/files/kibadofojotomikapide.pdf
    • http://szamosiszerviz.hu/feltoltott/files/bikuxilipadixixebuvepiwa.pdf
    • https://svetplus.com/userfiles/files/12209692387.pdf
    • http://kbcsisa.com/upload/fckeditor/file/5301320197.pdf
    • https://beauty-full.ru/uploads/files/monabekol.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210904_99D08DF306B8A8E1.pdf
    • http://webspace.mysdam.net/images/newsletter/files/pevexob.pdf
    • https://jordan.si/dokumenti/file/62456966743.pdf
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/33477375657.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/sodapitaxiworivise.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/zefesuzijobokotovip.pdf
    • http://jarosi.hu/files/file/zumotobo.pdf
    • http://goraku-sangyo.com/userfiles/file/18963271919.pdf
    • http://vivatbacchus.hu/files/file/22171720876.pdf
    • http://charolais-hessen.de/write/userfiles/file/davudebum.pdf
    • http://charontrade.hu/data/file/guviziwofizoselijolabujos.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ea995bef8d212b034473bb571d848aab/61802719273.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba64.bin
aac02f1bfc80945867de3824f48e52e200dd81c735b8ae86fcde027d918f70d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 10716 bytes
font_01_sfnt_off0000d324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 16792 bytes
font_02_sfnt_off0000eb36.bin
2ab46cc4c06e5a00cd033cf7dcb93c81a18d8d3608c7a6a5d6f6764d2946a6aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 19652 bytes

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