Malicious PDF — malware analysis report

Static analysis result for SHA-256 b208fd7f19d9881f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 23:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b1945763ed8d63dd5a3e8e9595f7ebe SHA-1: 8a591d0263ccffabda9d7d6702a1d5b18d4d8f76 SHA-256: b208fd7f19d9881f01e6687faa1f2085b3192bee2ddef634810c6d366bcfce89
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077469349331---pavine.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/aa52a974736f7f4a4b76bfcb1348a697/21187086660.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608d436589d5f---tejasadovonuvip.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083728a9fc15---fekizojuzurogemulasijaw.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f92ae70386a---tutakuvo.pdf
    • http://stpatricksreunion.org/clients/84553/File/84060126946.pdf
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/xalewodexukabenapelixap.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3e1c49c0---16855914446.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9427a0b720---56834921169.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c98306a4b48---66578006562.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/7d08590c264f08e2d6e76f2de57d6d7c/25371324851.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/38947983074.pdf
    • http://caycanh.vn/images/fck/file/45375463910.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c3beb4985---numol.pdf
    • https://snqrsl.quebec/upload/editor/file/jisisibiliputogifep.pdf
    • http://arniestribu.com/campannas/file/muzajowe.pdf
    • https://radmangroup-ye.com/rgfiles/file/57135709390.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b98a3a5ae3b9f57051234d6478888aac/51031335349.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44166e025---34308871549.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7enlrk1bmau0sg9m48gkh59lmq/zivare.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a5d1cb03a09---dixafupowaponako.pdf
    • http://madinaboys.com/easydo%20v2.00/files/uploads/luporefi.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2b1f719b5e3e8c403281750c0dac7bff/toxulutogegizaronuwixutik.pdf
    • https://kaktutzhit.by/uploads/files/68773692374.pdf
    • http://ansonseatery.com/uploads/files/ladedetomu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=base+imponible+definicion+pdf
    • 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_off0000e288.bin
0a62ed407765e14572f363ece28fbbcd122c4bc58a34f914984de36e2196fce8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 17112 bytes
font_01_sfnt_off00010e82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 16792 bytes
font_02_sfnt_off00012699.bin
f331b1bfd3255a3652c6ddf492f34d1d904a20b69fc82df06990bbef32f695f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 10776 bytes