Malicious PDF — malware analysis report

Static analysis result for SHA-256 200b337ac913990a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 07:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 107e4574ab74edf766872d0d1db86f11 SHA-1: 5bbbb65ad75ea5e9dd984e3237a378832647cf94 SHA-256: 200b337ac913990a945da2a78803b3ef1929ea2752e321614edc63c2870fedc2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and link distribution align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://df-2.de/images/daten/file/57716027274.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3dfa18f1---65974877007.pdf
    • https://kawanmto.net/contents/files/44032147293.pdf
    • https://pasarantogel2.com/contents/files/22163726263.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613866b50db9d---sanifu.pdf
    • http://gazosilikatnn.ru/uploads/files/vubufikixapekapejor.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/tejuwiwamiz.pdf
    • http://sirindhorn.net/upload/File/75921085618.pdf
    • http://kustari.net/userfiles/file/59022144407.pdf
    • http://trungtinjsc.vn/upload/FCK/file/jabuxubukazob.pdf
    • https://hidropomp2008.com/uploads/userfiles/file/9674399373.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f826d23f---dagorunanex.pdf
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/tiwusoker.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/lezaruritodumadavevarig.pdf
    • https://ontech.vn/images/ckeditor/files/taderemufunob.pdf
    • http://vizit-k.net/uploads/editor/files/bataja.pdf
    • https://signika.pl/Upload/file/malosagiz.pdf
    • http://stl-hk.net/userfiles/37330781078.pdf
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/menuwemumifamusatovetev.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/65278471791.pdf
    • https://laundrybyconrads.com/nbloom/fckuploads/file/mizomozazunezipikonovavi.pdf
    • http://antropolog.ru/userfiles/file/35729293893.pdf
    • http://peoplefoster.com/pliki/76447704982.pdf
    • https://mkontroll.hu/File/polupufadez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+light+violet
    • 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_off0000d997.bin
e52918a9d996775ed25db69d4383c25a0dda37492ab34721a6241d1c745a2b09
pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 18292 bytes
font_01_sfnt_off0001097b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 16792 bytes
font_02_sfnt_off00012192.bin
8ce2834834dcff08a9b08e62357c9cebcc604a4805236078a15692ae9dc444e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 10416 bytes