Malicious PDF — malware analysis report

Static analysis result for SHA-256 2620dffae9e0ecdf…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 14:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27b8245b6c560ca58946fe62e1840ac0 SHA-1: 1a0b8e4477374163a9bbe9995d74709f53309f92 SHA-256: 2620dffae9e0ecdfdda8051cf3fd55c1177e729f414f1302272b457054160d59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=whatsapp+para+tablets+android PDF link annotation
    • http://ottomaniantextile.com/userfiles/file/dakuduvexoruwud.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/nopavi.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/mujativu.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/82935794975.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109201935218498.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/pukovebagapumubi.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/68725592807.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/u47lhdcnipuq76j48ntefee1qo/94927122192.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/84440501903.pdfIn PDF document text
    • https://hujanuang.com/contents/files/67107849172.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/2299983456.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/94783993609.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/mamabejosinufeginawigo.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/nusorijixororedov.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161378ada9a1d2---17495072235.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/526888291a2378881f026e5490c34387/dojupawejaninasalibazu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c48ff9576b---gowolekesafin.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/tibixapebalugagani.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9da871a45---89409359194.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138760465e2d---wobumiba.pdfIn PDF document text
    • https://blokhol.com/upload/files/lalurojipodirozazinotu.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/41569945957.pdfIn PDF document text
    • http://websitesample.in/atlantis/assets/ckfinder/userfiles/files/mavevuzopugakuponolusuwi.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_off0000aff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF9 10624 bytes
SHA-256: 9b0295a2cb5406432ed4a45f01960367d71b6c2fff8ff00f711bf8565a32023f
font_01_sfnt_off0000c7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 16852 bytes
SHA-256: abdd1d459d8fdfb7dd12189823b1e58bdc4c6db02b537ba6063241c6ab4e1c60

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