Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cc1b7b26de2737…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 23:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54cb58d850e561bd6df8f827410c8601 SHA-1: ea932a0f37c8c267bce124c8e53cdbabf590ce30 SHA-256: f6cc1b7b26de273764a780ee62cc7bf6694d35677d1523204b37e44c2a4f7639
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of these links and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://archism.ru/uplcv?utm_term=android+play+video+from+url+example PDF link annotation
    • http://westfallassociates.com/documents/file/51309877359.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/33715608945.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/84156491201.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/zepawakopaw.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/85e94078298d8bf3c2b861cddeb94740/wobeloxilawatuwitox.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/darakagejebusur.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/fobulorop.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/zuxatokuvijiwogilifu.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/tejunefizanidulumokilowa.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/wiwekewewi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ois67i4n55c41lfrvu672m0r02/nogumusevamulo.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/xelosudijidoporafet.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8b9d93ca---83232557850.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/jugafetokoli.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/dukoxesupa.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210904032625323.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/44393527892.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/77116916603.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/58502569463.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bvkhom7gp58opop09kghtm1v9l/dizosugalukotafakijap.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/39566429853.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0d93e452---vuxosidomemobilutiriwe.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/62170899555.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/nekabobetajexit.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/6876383256132d844d653b.pdfIn PDF document text
    • 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_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 10756 bytes
SHA-256: bb6ab68264715b0ad102c015dfc703192c4762c05e2d6b5f4af84effb44856d4
font_01_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 16712 bytes
SHA-256: d3f969637a8a68a2b0d6a79d5859f0a3b75ed4f77d8bb91917e218175cc2a2c7

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