Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ee27946f2c6be6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 11:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7c896daa6ef69f4bb49ffd069a5754b SHA-1: 433327fc2cb2a0b557ce2f8e941dcb4ced6cceff SHA-256: f0ee27946f2c6be6dabfc11675b173fedf9f94ee0543ac9627ba0247e3fa8d2a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or distributing further malware. The PDF structure and numerous external links suggest an attempt to exploit user trust by presenting seemingly legitimate content that leads to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://danielfelber.ch/userfiles/file/64837140629.pdf In PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/geguxizixuw.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/15253233526.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/bd6a7cf0e78524b08300957123c23244/11817015674.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/79a97a4eb1c297170ce3eece2050991e/dovikurevogotubimudoware.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/32979901314.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/30261115928.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608f7959e8aac---16502981068.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6786f26f3d---dosajewame.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pukue3uo7c6htv8hu37fhia8lo/77535625731.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/catsia2eme882cgivg48133or2/9923543114.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/pixajowa.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/66940869323.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bfc6f15099ef782d02397d00aa80875e/79375815603.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7be4338ea---vonovozejolifalap.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/83728729037.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608499f7bfbe6---72736632373.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/40296523281.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/29923998246.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/wowuxefibolizebisa.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/10201466451.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/kupedavoku.pdfIn PDF document text
    • https://egf.tw/test2/images/file/pewaralunezokakogezi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e144225b81dbc576a6a1a5306689f3cb/54911207350.pdfIn PDF document text
    • http://ijfbn.com/editor_up/69355721637.pdfIn PDF document text
    • http://handgun.ee/media/file/wokawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=magazine+of+concrete+research+pdfPDF 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_off0000d186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 10908 bytes
SHA-256: 060d9b1266da114c343d59346a6800b2dad14519b1f5bc2bd20ed95436147c19
font_02_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 17632 bytes
SHA-256: afd9e4be1ae514febefcd73b40cc3b05cc54845c467f4f9133525d79a92eb868

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