Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc43109a1ad2e497…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 01:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d47c2493833978196ca491edb1074131 SHA-1: cfa2a3cb1098f7df99cafb107e0a4bb52a9ad9eb SHA-256: fc43109a1ad2e497e97b39e92d4ef310178051626a1d12272fff476dd9bdfd04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected 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 external websites, some of which are hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing content, possibly related to weight loss or other deceptive lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=how+many+bottles+of+water+should+i+drink+a+day+to+lose+weight
    • http://cbgnfinance.com/userfiles/file/45093212110.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848f95b9356---xexofusaxoto.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/terediladuvuxusin.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00ef17663---77215865517.pdf
    • http://arniestribu.com/campannas/file/vedidiwikedajiwezajudi.pdf
    • http://soflocops.org/clients/83264/File/35044091364.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608476a083ceb---laposuzojakozusamidolutob.pdf
    • https://ekransamara.ru/files/84361125505.pdf
    • http://otvorene-srdce.sk/userfiles/file/70647657661.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084dcf7a131e---26833994711.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d92bf4b93ac---zatoxo.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7a02c573ff20ecc72c974ebbce5857b2/wonelilaxubuzabanibogexo.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a88515ca9f3---wugufurigepo.pdf
    • http://drivescuolaguida.it/userfiles/files/58674111764.pdf
    • http://medob.org/SITE/files/editor/file/kixakafoziwelevuraz.pdf
    • http://katachizu.com/img/news/files/potuvixitonewiji.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/8d78bba3ee2e6e01b9324ae20d689bb2/digudanawafu.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2fae610821bfbd510a2bd4d8fb850c29/97161522485.pdf
    • https://loyallcanada.ca/editor_files/file/53618500287.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/pirububimedasinerukila.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2umll2f4k7ihjuht7lqodhvla0/75913539608.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0345a808693ff29c2eb8f2f324fcd5e6/xelefajawowepozanupufix.pdf
    • http://ackerviewguesthouse.com/userfiles/file/12973830413.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895f1583a4f---66185569188.pdf
    • https://khanikango.in/file/sumulutatajiwixorebiz.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ede9fcefc6b07d934129eef09e4d7f0b/wajowo.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7bd655e38edacc234224fe7e5477aba2/viwikebaparodi.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_off0000edef.bin
ba48a4f47a65e8993f752f6958fa2006c36e87c51cc665eeb2acd9b33b07010c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16732 bytes
font_01_sfnt_off00011999.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 16792 bytes
font_02_sfnt_off000131b0.bin
1572d69f9deae79ad425d44ec92bba9701041c570136a586594f64c5db5b5acb
pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 11324 bytes