Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec87830bf18faf13…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 20:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eed254a6d75a21340a4cfd75b90dca56 SHA-1: 26c168a5fe2b310bb858c7fc7c11902874845f28 SHA-256: ec87830bf18faf135ac82f64ebd09d969fe9a53905fcc4d6b2fcb9417ab57aea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs indicate an attempt to obscure the final destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://unique.global/wp-content/plugins/super-forms/uploads/php/files/d0d7bf614278be53eea36746f3503276/lorefowekereduzuwisif.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b2b853870309553d7fc0ad516fe0812a/84575067813.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1c00513abacb6bb59cf80d7c285e45ad/39625131555.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc6f97293---13049893947.pdf
    • https://biothiennam.com/media/ftp/file/56183028791.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/03654f5131fe574252f027596fcfbdbb/61753578638.pdf
    • http://ajtoablakcentrum.com/_user/file/gugemexozirupezepirufek.pdf
    • http://abpaluso.com/upload/file/jedetejukek.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3181d78efa---nedamorinedu.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c723f13cda---69076455964.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09ae81371---wufegojarejulu.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e7f35683---jidisizujegamowisusup.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ff3a5038030552d24834a3a872c3e49c/94757468118.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608735fa07e13---56894012743.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/12853922396.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c0906ebe---57767691862.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1cafcf013597d67394033928650f2fb4/rivulixijixolipej.pdf
    • http://www.anclupnapoli.it/userfiles/file/43458983048.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h42u70pkoilcrvnm6hh2p6h9ql/25643046150.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071fae40a9e4---gapinogu.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210621_13CB74ED4E257A4F.pdf
    • http://aliceinformaticasrl.com/user/pages/nelenazomasu.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c064136c2bb135404eba42a8cf242406/27737970311.pdf
    • http://gbagencement.fr/uploads/file/venesodotomawipojazapij.pdf
    • http://hondatayho.top/img-ngocbao/files/vewaguborasajarem.pdf
    • https://daaeportrett.no/upload/file/64156649216.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=deed+of+absolute+sale+of+unregistered+land
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f5.bin
38a2eb25b0c71735cc2a565bfa95ef130a69caa30dfc648089fd84ac2058624a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 17380 bytes
font_01_sfnt_off00011594.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 16792 bytes
font_02_sfnt_off00012dab.bin
be10deb469c2dc5476876efc4ebbe2032bb4f8aa1fd805e9a49aa688d315bb8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 10768 bytes