Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77a92e47cd565f1…

MALICIOUS

PDF

112.1 KB Created: 2021-09-06 02:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f94cdf839999d2559d4c7c35ef11f1de SHA-1: 0f05f73db11ede5f0259a04f689e14b0705149c6 SHA-256: f77a92e47cd565f114e706f10d26b77ca13f5a0d49c81d30c130f34ff452ee3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary purpose appears to be facilitating access to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f32a8610b---fuwunefaluwazosubipij.pdf In PDF document text
    • http://ippinnudon.com/uploads/files/bidutilikavisegowupafu.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/69840534031.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081059c7cba2---98756533886.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/36095224657.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2438b81c---57610744624.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/huue5tqtuvuocu6jtaj42bt4uq/96098121319.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/61869167509.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd314a0ab8---39068405017.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/besomeratujira.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124c2337c16e---dikozisopogugulifigopoge.pdfIn PDF document text
    • https://khanikango.in/file/56932972190.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/61261908501.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089156fbeba1---gorepiwi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d20f69b90---vugememawuwuf.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/90392653511.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/pudonewazugugavuw.pdfIn PDF document text
    • http://wjcopy.com/upload/files/27360732890.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/bopivuxonukawijuwir.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/tasibo.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/62793805747.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507094115669753.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fb0ce9abb---59211167837.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/abc17233c1c3d55b541379eccd6b70ce/fosesoxisivitulukipebik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sistema+de+frenos+neumaticos+en+camiones+pdfPDF 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_off00014d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16594 20216 bytes
SHA-256: e3ca7f211a76f679817402664365dea88a15e8b92baeac4ee9defe0e3561d5da
font_02_sfnt_off000198de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198DE 10908 bytes
SHA-256: d9d04a61fc6fc54cbd66f8651ec76c76a5b80a3e39f292a654a9ee3416da9b5c