Malicious PDF — malware analysis report

Static analysis result for SHA-256 279cc7f2fe522495…

MALICIOUS

PDF

155.1 KB Created: 2021-06-29 02:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f8a81c8990f8e90377c8a8072c8b3ff SHA-1: 42a7f541913c1574529ac0fcd382bc203ae63845 SHA-256: 279cc7f2fe522495c26c831428793bd98e5fb2467a11a0fafc5c7e56b315d26b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malicious content delivery mechanism. It contains a link farm that points to numerous distinct hosts, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to further malicious content or downloads. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 http://grandchainfamilyfoundation.org/clients/85333/File/burobera.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a7b5843b9507e6536f26dda806aec3c1/gatawepatugenureboj.pdf
    • https://go2germany.ru/files/file/2467844820.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4e161e23d1d2151dbc616c28129e2cae/bagetebejipa.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9e0e4b9d7e45eda9d9e58ca29f3ded01/68675194302.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5ada67238408dc7e03390e52a08772bd/51323285583.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fe909f52a---21674537999.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/81v62ollnekhkd97g8hobes3hc/runubivubamapaludozakurom.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bbb02b4e8eba1754d6ca9f98f576532/57920759558.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/751d5807fc84878c6821aaee9f6fe0d2/65888697322.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/gojadopugogekabemorifu.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971a2a5a0b6---62535334770.pdf
    • http://msslink.ru/userfiles/files/latewedowixidobeg.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ead3b6a9---bidezuzetulopazum.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ujfv77e8eikifdfkpn9d4pmg5s/defidasazumuroxedoxebi.pdf
    • http://vtvxm.vn/userfiles/file/suxivame.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/28475977491.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca85d4f5d3---74937504136.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/867b07028ccd27dbef2ec005ede481ee/gawebadixelumaka.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9921d31b02b7843cecf43431f9d48bbc/sexexanaxom.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072642a6da0f---gijabavadusalopaxilekuke.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38b9257d90768a6bcd9ca815afcb96d0/4077389839.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160910ca0c3be2---zijabuvilawubujozip.pdf
    • https://penal-garazh.ru/files/9771337022.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=manga+site+with+continuous+pages
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ce05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE05 16792 bytes
font_01_sfnt_off0001e617.bin
c18f0f0ef5ee1bb508acd12e404da14a1f9d894aec15aa6247488561a40f0c43
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E617 20304 bytes
font_02_sfnt_off00021a25.bin
f8108f5735dfef85da67f7dfa9dd3c6f693af74bb0edd8b069d3be00a71c5e77
pdf-font-stream PDF embedded font (sfnt) at offset 0x21A25 10688 bytes
font_03_sfnt_off000232b1.bin
721447cccf3e8ce03904a55cceae2475c7938d38bafb10e2db337979010c26d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x232B1 13908 bytes