Malicious PDF — malware analysis report

Static analysis result for SHA-256 3877975220403eb9…

MALICIOUS

PDF

82.6 KB Created: 2021-07-01 19:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e08ec29f251475347fb9d6519007c3e0 SHA-1: 81d63e3ecb6fb1cb3b74b8c0c836b662a80ab032 SHA-256: 3877975220403eb92496b5ebd82b644bfe72bb4df179b4f486fefc11a590bcb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774855710ea---16092292838.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084309449899---tubejojex.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/421d3fc1fe813dac639a45b6873b0d30/11375868533.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a75602b6---safan.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab79a252b4---25729384191.pdf
    • http://www.awakohchang.com/image/upload/File/ilurujanu.pdf
    • http://myucmas.com/userfiles/file/26086199519.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/68ca2b9e6763e1c393b3fe9327a25362/18971022980.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ff513362---70450307284.pdf
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/1320092887.pdf
    • https://ekransamara.ru/files/tapamunubabamalojura.pdf
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/29321500343.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1862ed2f---walubevusemisisutu.pdf
    • http://tuzvedo.hu/elemek/file/85468954744.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072b58c2bff2---mabumagerikobubepobojegof.pdf
    • http://alarcon-v.com/editor_upload_image/file/masamepuledopowuz.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2949e51cc1e527fd6a314db37cfa62c0/5539235413.pdf
    • http://drairtools.com/ckfinder/userfiles/files/fukuwalise.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfe54b930---musujevumoxikiwopazorod.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607971d1a1951---zitorarifejuv.pdf
    • https://widepolymers.com/userfiles/file/xonetisodiwuzot.pdf
    • https://0900107678.com/upload/file/35361623744.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ready+to+wear+apparel+analysis+4th+edition+pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xivoxiso.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_off0000dfd0.bin
dc70da376935ead000f7a480d4dd988fe7256fc530772d7f43e2b41e65951e28
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 17400 bytes
font_01_sfnt_off00010b85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 16792 bytes
font_02_sfnt_off0001239c.bin
bef591e0d362f80a63ffa43a414bfb59bf881d587a06a22b03f4c3dce2b4dbdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 10916 bytes