Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e6dab5e346e9c2…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 14:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4b0228b5910fb3a6226c76c57942ea8 SHA-1: dabc992b911f5b6e7b6ebefd312d89e2c4d52890 SHA-256: 03e6dab5e346e9c2bad306a7992ddf49d8e170ea9235472360aad457f95a1403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=jio+music+app+download+caller+tune
    • http://akicgiyim.com/userfiles/file/sekopobivelag.pdf
    • https://legouic-peinture.fr/userfiles/file/90806147364.pdf
    • http://botosani.ro/img/uploads/file/gulobamipora.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r2mt8cutnul5pp0gblqibg2sv3/50474877113.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/fugamumuwexuvemumupix.pdf
    • http://imoroz.by/upload/file/20497640408.pdf
    • http://elverum-revmatiker.no/images/file/tigudivu.pdf
    • http://razzledazzleevents.in/userfiles/file/51679011790.pdf
    • https://aildf.in/userfiles/file/44504299676.pdf
    • http://tucholainfo.pl/userfiles/file/kopilibetuwe.pdf
    • https://insinkerator.us/images/uploaded/file/66788120608.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/tubonaturaxapaberarosomo.pdf
    • http://fiumaradelsossio.it/userfiles/files/jupij.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad84218891---subiwolobav.pdf
    • https://guanlai.tw/uploads/files/202109102312133238.pdf
    • http://arisutour.com/ckupload/files/82609347279.pdf
    • http://ejmk.com/ej/upload/files/53678261003.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613930731ff6e---75256323440.pdf
    • http://malovanesklomh.cz/images/file/89718929565.pdf
    • https://cottingham-group.com/cufiles/files/71257079967.pdf
    • https://alhurwallpaper.com/Files/files/35074709401.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/96215504712.pdf
    • http://blpest.com/UserFiles/file/pabofawixonemasuw.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vol77q644dnsktfos9lamegim1/52273579078.pdf
    • http://vhktn.at/images/content/files/dewizu.pdf
    • http://newtrichur.com/userfiles/file/31275055048.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_off0000e9f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 16792 bytes
font_01_sfnt_off00010208.bin
4d36b6112d67e781e66732560df442176b4a137fc748bf9d4d8206b7efdbe5cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 17964 bytes
font_02_sfnt_off00013099.bin
eac100781daab0f330d179f3be99babd906eba76a4c5460fa3af4019c1be35b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 10852 bytes