Malicious PDF — malware analysis report

Static analysis result for SHA-256 db611276d0217f66…

MALICIOUS

PDF

76.6 KB Created: 2021-06-29 15:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: afc8319bb6be4979e83e311915fafa77 SHA-1: 12998411f9fdab7d0c23e6b760e75b6415b0b6ac SHA-256: db611276d0217f66299c3555a22d15af1d6d0a414101a7ffefe6be84508c3394
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which are likely used to host malicious content or redirect users to phishing pages. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into visiting these sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca06d98e5---86251159795.pdf In PDF document text
    • http://belgium-ex.com/images/blog//file/11792814514.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2f296d7ff2aa5980ba8c907f946e270c/lajiwamujukoxotixonotod.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b40ef07aae82c5c3e924faa6eeb7997a/17330754740.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e3b9f4f9---guligaxevuluzanituz.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/vuzeka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a612e91b708---34741785567.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c002b34f3f0---jobepiraduziv.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8ea0fbb2---womiwesisomisix.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd23a85a2---dirazomituvu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbe9e1492---bezasulejodewofeb.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb9408dfe---fidebajigolexusax.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/408b8d84001bb7e33576d3694b63e2b3/sapotazonafoneketawon.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4cc27a22fe80f7423f065743bf2e6f4/gavulebulilesererumuzupi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ljbmdak59pakgecbv79fgpg046/veromexeruboduf.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/pekokodinaregi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1ba848c2---83165778293.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4840169f802988399396d759492c0602/zivujagadunolawo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f1e19e04c---36386927582.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e60916f84e---35860054904.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9247a583c02ee9c7d085731a66603952/nepep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fooevents+pdf+ticketsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 16468 bytes
SHA-256: 0b1b0f6d151c755abc1b5ab2be4be534de8462642c5bb8a25817c62089306e00
font_01_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 10440 bytes
SHA-256: c06fd0ca5ebb3d633ed8d4181e9f6fd6ac977f9c71f46918586e1b6b6d93ca26

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