Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1989f494b584bf…

MALICIOUS

PDF

96.8 KB Created: 2021-06-11 07:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 918839886165798710fecc3104134948 SHA-1: 518e1199a59b546fe0c1c00345cd3728875b470b SHA-256: 4a1989f494b584bfc662615c9a9188b6b4d2cbd15162b5502a707840002daf3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the compromised CMS upload links indicate an attempt to redirect users to potentially harmful content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://garglob.ru/uplcv?utm_term=chaucer%2527s+canterbury+tales+pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5399276e---7052573108.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160866de034591---wutomegigasisijiboxura.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jujv4c7vng1s3k10lbea46t4q2/jaratolilipup.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/60768006840.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c013930f0d---zawulefetopuf.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93aff0411---9073115180.pdf
    • http://tourister.kr/userfiles/file/63513515553.pdf
    • http://karat-dobremiasto.pl/userfiles/file/17516491825.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160941273f247d---gomakonawezigejinoso.pdf
    • http://sacoorhealth.pt/site/upload/file/74374061348.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af8164dc6---23918107953.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956bae5f529---dekotubipogebibavugamu.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8a10e2cc48cceb1ea5c4623853a2c527/83760532950.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lg7uv26v2hp8u9a650289ocg66/bigigafikawalo.pdf
    • http://archerelectricsupply.com/userfiles/file/71338793843.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef1d73374---39141963041.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011d8f.bin
73db29603bb6c2394415268ebb1b85588c2c90b7d893a9b63f470305e9ba6ab4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D8F 16984 bytes
font_00_sfnt_off00010b2d.bin
fb48bea5010a66d986e8de404c6a8a3630511f1d37dcd072a5715bba0eb1362e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 5424 bytes
font_02_sfnt_off00014c07.bin
e846bcdad4dcb6e3ae75cbbfbe186d9d64c6272a3b18d4e9826330502e616943
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C07 12348 bytes