Malicious PDF — malware analysis report

Static analysis result for SHA-256 097641fc3a2cba90…

MALICIOUS

PDF

83.2 KB Created: 2021-10-06 21:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4ea888fccff1b659e8427c7218223cc SHA-1: 1db006d573e8e727f3fdcd384e5cf3728df2ccfd SHA-256: 097641fc3a2cba909db67d0552cc16a94638230798697842b22c2950e3cf4dfb
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. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially compromised sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or solicit direct contact, likely for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://tl-systems.hu/files/files/40221969815.pdf In PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/8449972785.pdfIn PDF document text
    • https://kawanmto.com/contents/files/87746782420.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210910065408248.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f57fe118ded084dd8434b8a5053d8741/samopusubomepebenipiwutef.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/dijilimosowazimewako.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/nobanapi.pdfIn PDF document text
    • http://chipgene.com/image/files/20210907_190339.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/semufelew.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/jasukutajelu.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/72619895729.pdfIn PDF document text
    • http://labonscafe.com/userfiles/nilozanemojuladoxuzopu.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/gamojabose.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/bujoxi.pdfIn PDF document text
    • http://jaqalsports.com/files/file/69285941464.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/33832276066.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/33705954548.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/60e85c11e1237a4d190a6e9e870e2c78/79317823362.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/ruvoxerunupixi.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/63525450418.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/24a819ef0181e96673cc9a677226fd01/tutirerani.pdfIn PDF document text
    • https://togeltop.net/contents/files/83003149980.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/70256174029.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/banipetubadusebenudazo.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/xokevabuli.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/bexime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=eminem+recovery+songs+downloadPDF 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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 10864 bytes
SHA-256: 48029460a163543653b758e48df383797c3b663eeb70f557903750761aa2c15d
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 20000 bytes
SHA-256: 86a70e06113c4e65b533cc9356a0736704bfbd55530bbfa427254a19c33f0689

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