Malicious PDF — malware analysis report

Static analysis result for SHA-256 029c1d450de1113b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 14:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a21ccbbb5d78c49603bf405fdddf66dc SHA-1: 64d187d93f25a68e69a401ff2a1a410cb0a1bcef SHA-256: 029c1d450de1113b7ddb6405c455b402ff3de15f94ae446983145c2b987b6dd5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to facilitate further stages of an attack or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=super+gaming+wallpapers PDF link annotation
    • https://autotronics.vn/userfiles/file/88943245656.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/lujuxigopupafobon.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fidosipugewaf.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24fa99b5a---mebatapibuk.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/64136496758.pdfIn PDF document text
    • http://esistore.be/userfiles/file/dapaniropiw.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/refagudasemej.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210913_031014.pdfIn PDF document text
    • http://195exim.com/datas/files/mokenofenurisilirijoliwom.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dca59848---49492131212.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/49960949259.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/3372632422.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/vonujixawenaji.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/70593483710.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/desilazamenuv.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614405795556c---74808918756.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210916102541_7ropyd.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/vivipufiloteveruwoxe.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/64358012583.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/27973492199.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc3f0550e---sulitomuz.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161329cf35da55---kififoxobemub.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/rikidafo.pdfIn PDF document text
    • http://secretinvitation.net/images/files/26815830330.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/22959273379.pdfIn PDF document text
    • 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_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 17404 bytes
SHA-256: 5b92978e799328833353f14500ba47d3eeb856cbaa57598484f0b69b2a6acba6
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 10636 bytes
SHA-256: 46974f77ebb5a859e37fd4c213283ab0480bdca4950c3d5264706981648d0955

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