Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac856c0c2b44044…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 21:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4993023d86a0ef865e36e2c6686d4424 SHA-1: 3df41ccc650217585b89dbe965789cd75211becf SHA-256: dac856c0c2b440447f36870bb3b6b8f9422cd93f20f35f09bee8bae4de79bbec
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm, suggesting a phishing or scam lure. The 'SE_CALLBACK_LURE' heuristic further supports this by indicating the document may prompt users to call a number in a deceptive context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://phillipsbricksalumni.com/clients/56168/File/69878990609.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087980b7381f---67739777421.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/27863339149.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1f5f7a83e3b42e909ae498568b3e8d21/tomutig.pdfIn PDF document text
    • http://3asoft.vn/img/files/3688594475.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/28213570120.pdfIn PDF document text
    • https://activepymes.com/pub/file/kudabovume.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f98722c8---36805977831.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc07693514---zefavimo.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/39142012430.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/4169483406.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/fopagofa.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/rojujalisitagezixo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/kg57qjqdrouu3ds2id4du4jho9/83506903359.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/28030765574.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb97505c---95761750891.pdfIn PDF document text
    • https://olterus.info/contents//files/jagizenajizevajugig.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dba58a2465a2994dbf73e82337af56c0/16296931176.pdfIn PDF document text
    • https://songhong.info/userfiles/file/mumegu.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-7-30/20210730132006859375.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d169d34c---33934698790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nonprofit+mission+statement+worksheetPDF 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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 17572 bytes
SHA-256: 140e122b3d9258a3a8a2e776cd1dea73adc93dde41ddc794a60afb0d947228aa
font_02_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 10732 bytes
SHA-256: b796f886d684434488d214e23e632c337ab99474433724abaf19c1a8c7f253d5

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