Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d067aa4a6af0d53…

MALICIOUS

PDF

78.4 KB Created: 2021-09-21 08:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90be43b0b3b70702104853d1e8e86ca9 SHA-1: d6d8a053e53716e6941cbde3d913f733a925eb24 SHA-256: 1d067aa4a6af0d53deddcad208c174a453208bf67e65169d4d5cf221a2be308b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number for fraudulent purposes. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit user trust for financial gain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 http://electronicaindex.nl/images/uploads/89073844089.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161458cdcadcc6---57294583264.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/33966894528.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/zupuwi.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/vedexusinepivuxosefezak.pdfIn PDF document text
    • http://all-premium.com/user_file/files/wapokumi.pdfIn PDF document text
    • http://freeorden.com/media/file/26394323684.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/23358427677.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tobakivirowa.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16135d74de8b17---xuxabazagugilur.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/fuxuvununoziwiwewigil.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/63069759665.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/22315042262.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/95834144858.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/59244223109.pdfIn PDF document text
    • https://digireg.nz/upload/8444034390.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210908014830.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149027588c37---xiwewerifojamojogaxoluti.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/39931298025.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/640b9724ba27d539113607fcc42a514d/48355070523.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/pexape.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/24610633049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=get+free+like+igPDF 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_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 9964 bytes
SHA-256: 87714723d73228d4ce61ee0939e8626089817800b3d574c04d5e748815cbecb3
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 16856 bytes
SHA-256: 9ceb316f7bdc9c40ed96ed3f2e915120a57870b60b307eb2656f936692244c5b
font_02_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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