Malicious PDF — malware analysis report

Static analysis result for SHA-256 306765ef151c5f51…

MALICIOUS

PDF

85.1 KB Created: 2021-07-20 10:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a51a2ef32d36b79a6d2e87b3abc99763 SHA-1: a6ff31b9615977f6a5d037ac2584f3474db84d26 SHA-256: 306765ef151c5f51eb8132c900de69964086906fede75b6a06d88aff212ee040
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841bca0eb8e---tetusilevevunotolovogifu.pdf
    • http://uleshuzatshop.hu/files/file/41474416007.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210703_48F9C7A5890BE818.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuzubudakuvines.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/80713309941.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43f858fb6---xawedirodofemiterekozil.pdf
    • http://belst.by/upload/file/67552749053.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9752a47b---zodekosolapixajaxasajuna.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//6601032627.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7adafdbc90c525f3940cbfbb163a37c9/87571049692.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fb89d42884048116e55effa2a6a100d8/fujupimomufexiririkirik.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/orefavl0o3uqhh1hctti89s4fs/5828480542.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f2590adc---61571468014.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a42026092a1---19215562270.pdf
    • https://synersys.fr/contenu/file/25367346453.pdf
    • http://praguetransfer.com/files/file/50857822111.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1dedae83c5b5110afcad3320071c024c/gojafedezofofegarum.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38535e605---12159876238.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c15ecc5c77a---renima.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f859194573210a831e354aaa16526f9/79691416930.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/gfmke94l7cc9p1p7bj27rmj38a/fotevadumulorivimaveno.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d112205a5---65346184972.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=my+karate+place
    • 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_off0000ebd8.bin
70aef0ae2b49552a72ab7f7188cefcf17d3d66e771e019de0b8d8a35c00cc8fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 17312 bytes
font_01_sfnt_off000118c7.bin
e100e6e083afa533dcaafe5c2f2b69db0d0881d799b45984d392b793c1f9af54
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 10084 bytes
font_02_sfnt_off00012f72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F72 16792 bytes