Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1a1f281b8808af…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 10:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40d58afb23e1ac93c0d42ad504e83679 SHA-1: 6a4c81d9244e5d068594de0567941cca2cf80dba SHA-256: 7e1a1f281b8808afd4f9719753cf713d2be99dd06f18e9520efa6faa7a39da77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these redirect links. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://digitaldaya.com/imagenes/file/nefewuziguwanujerajuxid.pdf In PDF document text
    • http://stisk.com/file/juvipab.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc962af5ab---gesugizelodit.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080366cca698---tufemomigetozun.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/35725581803.pdfIn PDF document text
    • http://juha.be/_files/file/33630523773.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76d875a13---43823680138.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/jifunepowunokodenefapa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d76b3cd42---18954953385.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900fcb7910c---84784115723.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/62778097060.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff31df5f2---worosedebikekagotuxitiwap.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/42568452539.pdfIn PDF document text
    • https://expomediainc.com/upload/file/64133617157.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/difojoziledeniwezupizoxis.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/kexijekekuva.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/bavazunibexepuja.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/74449911806.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2c3aca7af28df71f7c492134331050b6/9561203420.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/goteworolobir.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n61pmegmsbm1b91jo6niehdf57/dugesobubosovamasukere.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/515789031.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/rajutegedekulosad.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/1544fb23e4d8098de6c11cd8ff4809f0/futupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=urdu+ka+qaida+pdf+free+downloadPDF 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_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 10656 bytes
SHA-256: 366eaac8ee13043848587c9bf024bcd40c1b796d43b2172c02d089ea9b1e5a10
font_01_sfnt_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 21420 bytes
SHA-256: 44260181a63e1d72db0b7b2a71f0bab6e3598165a72dfb5c35cfbdd89deeb445
font_02_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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