Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa413b82f748fa1…

MALICIOUS

PDF

85.0 KB Created: 2021-07-16 12:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9f04eaac3be2f09239c804991d056dcd SHA-1: 8dfee97edd3828ce5405bf576063c09bac4ee321 SHA-256: 6fa413b82f748fa1bb9b34f37270981c6dd42a4612746ba47982d7ac5828d5c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

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 http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/56c0bef8be48914c6a4c1687e24bfab5/givorufexopubojani.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0cb14a576e57f1a2aa392407872d60c1/soreduponumuxixovolobato.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5debaab742---xaxorokoxepil.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/18977506327.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ed857f15---89997948199.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/39945936420.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/436e009c6b2c01d074fd7157f805acae/94643325176.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab9cb8263---74604061120.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aff71ac9967---torijev.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/22801353572.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160add7a02d0ed---rolakapoviwijul.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091574b61681---pisizidotagovavurasojex.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe6b1f67a---19054727269.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/21909720868.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69jaf7mr8m82f9c0cpeufaq865/xatavutoworedobe.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a550b752c16---tikagiro.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/vetagogiri.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8o00mpvt1dgv7mkcvsihc2dgmi/16020427690.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609986e2b0da7---20755799956.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/81ba6854cfa78464eaafaa01e428cbdb/50014125188.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/musosoxezesemopiku.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/27704913390.pdfIn PDF document text
    • http://asfalon.com/__files/file/84263566624.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/46146752292.pdfIn PDF document text
    • https://olterus.org/contents//files/wazeke.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/virojabesififefuzagepekik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=blank+lined+paper+printablePDF 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_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 10384 bytes
SHA-256: b2fab45336f8d18dbeb10b65284886cb648411b11265345948ef2a0a2d58ae27
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 16944 bytes
SHA-256: 36f6b245434eabe911bbfa837c3beda8372b0f07482a2919bd05e26459f71a09