Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5886ecc3d06a173…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 13:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 60352d17d31afa6f7d92d9d9badf4251 SHA-1: 1374390d0211c2b3a75ee1d8ff76b577a23151e2 SHA-256: d5886ecc3d06a173bf5eee25d8ee7b3692894558b10cf5166e3fe8149a98ffed
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV both flagged this file as malicious, indicating a phishing or trojan-like behavior. The primary function appears to be redirecting users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://marinda.ru/pics/images/file/90474587396.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f90de5d5c---jukidekamaditofan.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/27730211439.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a28d318d7a4---75290693962.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6tdb705m66vj49q8csej8d3hi7/mobat.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/hgkfg3t4hn8lgm5ijeh3629fun/62596463099.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/tulovagexagonipuwegirixu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080598a58690---6125931150.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/kipologanowinepa.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/ditifigajot.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/67469509832.pdfIn PDF document text
    • http://usateatop.com/_upload/files/beliz.pdfIn PDF document text
    • http://fittbike.hu/files/file/47731288878.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/vitotig.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/49afcd011c397eb6aa71fec3c640a66a/japitujivikikozanarosota.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3051c30190f53ad991249990c09d4247/43915298801.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/1638366588.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/df039b6245bb0497138cf37361f11309/tigupufijozolojebavoguma.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/najinufikerukipuf.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/64007937552.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/xiwuzobebozeguregiwatos.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/mqevl1msqei31vngtgf3mjor42/48618175569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+witcher+season+release+datePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 10516 bytes
SHA-256: fd855184cb29fad4f829e2200938c318b66eaf6d5026c735de1b400176a2f9d3
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 17632 bytes
SHA-256: 5b3a72fd484edd209e6b7a20b1d396843e4008b17186c9c9925b251a94162e89