Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ce430829d4ab1f…

MALICIOUS

PDF

89.0 KB Created: 2021-08-18 22:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 3202f210891eb6163134fa3c9d50690d SHA-1: f2c5f8903d4b91d98b4b5903e12502072293ec35 SHA-256: e3ce430829d4ab1f61edd4146618f29c4ce6f90eee0496bd7f89a5d220d08449
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable domains, likely intended to lure users into clicking malicious links. The presence of these links suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/486618583d86b9ef6fef1ffba7b8baa5/zureduzusivulapire.pdf In PDF document text
    • http://rentaruedas.com/files/others/9973477128.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/fabipasuwawisalakuzu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/femixewawowe.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/firorefakus.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fa7bf35e4401b9a54cfe417c5aee1e47/19691737560.pdfIn PDF document text
    • http://geose.ru/userfiles/file/4893209390.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/80b668ce71530b58fa8e90dccb266230/99447433143.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/67408476547.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b5c7fbb2---93676685548.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41d97b76c---89303532891.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m8ggdepla1od86gusbvrmiscg0/24298664824.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/nutozi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/94486653430.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec36f5cc37---52109604825.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/172dc794da06e705cb41036d1e13ad4e/rekolidirakupike.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91512254313ef427633d1abfe9781ef7/jatupafaxarota.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/vibamev.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/veledakofinosigivi.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/2141472408.pdfIn PDF document text
    • http://adice-area.com/pictures/files/46581373124.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/jopapenimufuf.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4be953cb38c53f8e8ce2d8e3d6b68b0b/20619308521.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/v9duk5uie53nv1jetq03g3vm4p/39884856573.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3c0fae47cc8d0da31a270d684f95f977/11490967281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=publish+junit+test+result+report+missing+in+jenkinsPDF 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_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 18084 bytes
SHA-256: 9bdb3914a328e92bb145108c48d0c008aacd5c7d82b9a954c50df403330cdc2f
font_01_sfnt_off000122a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 11000 bytes
SHA-256: 851f7ee3bd29aa22927c96dcc282c15ef122e2afbe159ad46c4fbe7bcd1914fe
font_02_sfnt_off00013bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1