Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2e3358d02704f7…

MALICIOUS

PDF

86.5 KB Created: 2021-07-18 17:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4764cec92e37aa93bcd994c08b993867 SHA-1: 141f66a50724c28d4af016e41b9286344c35607c SHA-256: ec2e3358d02704f71beaeb6727da3f1f36eb860cf25e45b70aead58e58d7a618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The presence of multiple URLs hosted on potentially compromised or disposable domains indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0cb67c08050c2d249262527a7ba5e375/85609441621.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9rccqv6dd335gfkp5asa7rpls7/68465947089.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/sovesekapejum.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/6820597173.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609784beb344c---18565581697.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa866aaeeb2---lagaxi.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/43208105866.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/bodupagovewavedojana.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/juzerudifirudi.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/xidudejepepo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/34gkfq9flj3m4dr072cl9k7eg1/5162921326.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/39949861674.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/vezujisixifetaxosom.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d983eca8873---64426169356.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ea6e2aa703e75d43dffd3924d9ee66bc/47921153670.pdfIn PDF document text
    • https://onlinendttraining.com/files/wabusokobara.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/konebelonux.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5b0f89a4a3cf1d1b92c33a0b473c3d9a/jezoserapubov.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c43202f8---nenosafuratizaf.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/vepikakamome.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/12831053664.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/93b495ec77a5acb445870bec067cfbe1/6401973631.pdfIn PDF document text
    • http://northcity.rs/slike/files/58955987282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+fast+%26+furious+9PDF 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_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 10112 bytes
SHA-256: 430296bc3ae2780704193e6b2769df9e1f4e91449bb4e3e40314eeb81cec0cd1
font_02_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 17236 bytes
SHA-256: 6dad399ef491b751afa299a3db48059b51089fffff5159879145c74cb3c8338a