Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12beb9afd389516…

MALICIOUS

PDF

98.3 KB Created: 2021-06-26 05:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8dfe51161bbc90631db48a167d8dfece SHA-1: 2cff898c7f64f2ded74e801eba8a4750f45dc3ae SHA-256: a12beb9afd38951650bd6eb68aeddd77762766600bcd57ca4aaf99d09c54317f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0d2deae27dcd567b93396a9a0093d56a/49404151127.pdf In PDF document text
    • http://www.iece.in/userfiles/file/55369006030.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/14370487365.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2106200227208301260zblszxum3yw.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dikoxijokutasisoni.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0bb7166567019338dee6dc21eca8333c/suganoburesidaluzuga.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/d6o4579mov7spjihi3ivupu0kt/65378275158.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607700f9c6d87---36198352878.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/zonebosoretanimasofowo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6af0becc5f17493487f1cfc60d50ca24/10921155475.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4178f3fa---40232740258.pdfIn PDF document text
    • https://waroproject.com/file/65143862998.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/50515925629.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e357bd8a---66482569748.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35f3e5cb3---94569046998.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/mj1emmsjdrjjdo559gkoqf041d/46747753705.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pt0gp7r1akmn8vjkd9v3iknd00/jujexerumago.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/gowodegewi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074f757abdff---xakawemerowisudebawor.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884ec3bae7---16506289769.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8bd55749b---likutepejuju.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ac820bac14133772a1f11fc631206714/sagefegifiviru.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/jiwuj.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/37417080289.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce099a81c---tebowusijozofawuxererom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=happy+thanksgiving+images+free+to+sharePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 18100 bytes
SHA-256: 71993136a88a5475f77d3e335eee19b988604fb02419af3eb93470a79790431b
font_01_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 11020 bytes
SHA-256: c7c8985f1bb47845e74ffd1d718dffdef23b8f8d9057385d38e9530aef5dc036
font_02_sfnt_off00014b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16382 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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