Malicious PDF — malware analysis report

Static analysis result for SHA-256 83369bcdec5981b2…

MALICIOUS

PDF

72.8 KB Created: 2021-10-13 14:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22a966a4892cbfd7a9f08e654fd5ede7 SHA-1: 9ef5d40ed1cd41d0c45601082caf38c6712a2a30 SHA-256: 83369bcdec5981b250538987c8f9aded6dcc69a2fe2a08d4edd3be694bcf0074
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a callback phishing or tech-support scam by presenting itself as a lure related to billing or fraud issues. The presence of numerous links to potentially compromised or disposable hosting sites further supports a malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://flapboxes.com/userfiles/files/96563348659.pdf In PDF document text
    • https://pachetedeturism.ro/images/files/lexisaxazo.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/dawuzelulapowiv.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202191498495319.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/79793892588.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/99988641257.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/11019798604.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20211009125318.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/5246189706.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/35936227380.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6695d2dcc---19623159235.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1616596b66475f---68862290003.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/rigoxeleb.pdfIn PDF document text
    • https://alibrahimtravel.com/mycms/uploadedimages/editorUploadedImages/file/15830862870.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/72686795674.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/77466298104.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615b44983fcd1---3268717972.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/20859159941.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/99176353051.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/65228254022.pdfIn PDF document text
    • http://all-premium.com/user_file/files/84103855084.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/16248958894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/u-9XGpgKpwY/uplcv?utm_term=class+11+relations+and+functions+solutionsPDF 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_off0000b50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50F 10652 bytes
SHA-256: 2a1cf54d73629d7dac2b5d9c088b5ebd7898e454c973fdc3669a8326af1eb0ae
font_01_sfnt_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 18452 bytes
SHA-256: beed6e6602b47691e6b097f942c965938e45a512ed8878b2f5d9bbbc5449e2ca
font_02_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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