Malicious PDF — malware analysis report

Static analysis result for SHA-256 4013b09632604740…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 03:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89337a4405816f3bd06b8f4732488b36 SHA-1: 350e643b5eb6c45f78add41a727b7daf1dcbae57 SHA-256: 4013b0963260474025d53be3fbe7d8f65aa108e8480494542209eae0e41f9d4d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://importfoodfair.com/userfiles/image/2021/09/file/12181409442.pdf
    • http://goldenteriyaki.com/uploads/files/derekijipezirim.pdf
    • http://taihegas.com/filespath/files/20210917075158.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/ruvamovalekoxize.pdf
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/xikebomigavisabanerituvel.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6343b5f78e2c8c146aa57383fdb469e9/53808913015.pdf
    • http://tipsclubcr.com/campannas/file/betezilano.pdf
    • http://crocepadrekolbe.it/userfiles/files/saxuxafadijoga.pdf
    • http://alvit-bk.ru/userfiles/file/93084106356.pdf
    • https://4of100churchstreet.com/assets/media/files/69979424429.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/32361733802.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zosonowopabadixetipevano.pdf
    • http://zimmerei-possert.at/gekidegomujifo.pdf
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/89773946791.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614059d0af8c0---56997894500.pdf
    • http://marleenjansen.nl/images/uploadfiles/87720318695.pdf
    • http://zafirkort.com/uploads/files/gujafikafowixofetebutaju.pdf
    • http://swaptoys.org/ckeditor/uploads/files/vawewafimirid.pdf
    • http://studiotecnicolamanna.com/userfiles/files/befamasirilosoxir.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/2991476377.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f4ac7c68---69752071784.pdf
    • https://matkinhantai.com/luutru/files/37691279161.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+uygulama+kodlar%C4%B1+%C3%B6rnekleri
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 16792 bytes
font_01_sfnt_off0000ee16.bin
88f9fa0ae01c4f5f00b38f69f89f82fe7c61f426cb2ba8e48e962148ff0cf3be
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 10872 bytes
font_02_sfnt_off00010688.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 16344 bytes
font_03_sfnt_off00011c7d.bin
fed7cd55e3d6f2c2d01918443e41fb8069b937ee46f9b7246b7a48e55f899a02
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 19420 bytes