Malicious PDF — malware analysis report

Static analysis result for SHA-256 2609ce7567492b8e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 16:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c928596cfe6ccc87baf6902f42dd1135 SHA-1: c7ccf8ab091145a6e909a104de4d95fc37372d6e SHA-256: 2609ce7567492b8e8a43d247aa6b754c0fbfca4a698bc8f8fdca88c2dfed237e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=max+payne+android+data+download PDF link annotation
    • https://areicon.com/images/file/givejonenopinem.pdfIn PDF document text
    • http://mweb.cz/images/file/defaderopumaj.pdfIn PDF document text
    • https://fototipia.hu/files/files/tutewidemagorijezem.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/75436607097.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f052387c48f768294d6105830237ac35/gesijimivirogun.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109141844194383.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/xerid.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0e670f78811f7da19eba3756a9b52953/86380136436.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1b6abf52---degisepibi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/vagijejotita.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210903_CE4E35F36EDF59BB.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/38702122579.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130365708fd8.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/95860043050.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/18500567130.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/21449529256.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/59186067591.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/rezejesinavatamo.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/wedutikugatojuvij.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/nazepeb.pdfIn PDF document text
    • https://mattress-leader.com/media/29652520186.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8062b09d---54298053630.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/pegoxutuvufel.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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 18484 bytes
SHA-256: f88ffbd14664b7e4ffee1f0d1a74f9892b18c21f5a05bf342b18172a8d700798
font_01_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 10512 bytes
SHA-256: 47df3d41da1f1016d7b94f01b29b4389f07b8f7feea5c2d5082fc5e6ec75fb58
font_02_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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