Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc16a4b3f0ff1b3b…

MALICIOUS

PDF

98.1 KB Created: 2021-08-09 06:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6de467cf38f83f9f1306f16322fc6ee8 SHA-1: 60df4603364dd659fc21134334b9de5be1c7c8b5 SHA-256: cc16a4b3f0ff1b3b5f314b2649d584a55837ce9cdae818329481a1cbbcb8e3c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, including compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/mawogewofoligorokod.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b5c79e39---rijakovaw.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/34759327571.pdfIn PDF document text
    • http://mylodge-naoshima.com/21155881261.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/97939700361.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3a9755dbd42b5b1aa1a1ed7e930fa198/zivugidevez.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/35409548779.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/tonabeluwadir.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/44528357722.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/widesituvematavur.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86980baf62---sobifarixemoxivituwuzuxi.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db172635b177f6f744fd669e51fd8c2c/zedavinoxuxinopogezidirug.pdfIn PDF document text
    • http://qca.ch/userfiles/file/74203637649.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/70353071324.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/55404428fe6dcb6bde84b86cf5b7e8bb/gipisediligizopojawumi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2ba0a7e7eb385d05609cea97f72af320/52142341324.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8f78a863---71521828937.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50440302034.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210701_002401.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/tulole.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/0fe6ac5cc6943f9addfc410ff639620c/penekasiwagerukikud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=handless+millionaire+2+unblocked+games+66PDF 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_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 11228 bytes
SHA-256: c8ab425d810d9a6f1f9dc25758ee7d7ad7f4df3f75e9ac2236cc1fedbe1ec9ac
font_01_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 16968 bytes
SHA-256: 40cc00bb3ceefc80b80a8d04eb342f9e1b5c8159494e06ec7a2cda0d0f77ac1b
font_02_sfnt_off000162bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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