Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c714b80ec1157a…

MALICIOUS

PDF

93.1 KB Created: 2021-07-31 22:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9bfa4e2788bf3df6e0c1ee359ada965f SHA-1: 43e9e4e70d8904b31e3dbd6058cd0d87797912b1 SHA-256: 25c714b80ec1157aa8d68fa1b592c84bcb4ce966493c27c0f4042c101a5bee18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize a 'link farm' structure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://queure.ru/uplcv?utm_term=difference+between+chordates+and+non+chordata+in+hindi PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160723a9ceb4f6---24728462339.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab26592e6b---13837013992.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c798b24da---70102254095.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/42685788215.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e053aaa47d42f107811c139ada8a60be/98285628305.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8307be5c70be50af4282e76e3b0b9bae/tepojudadaral.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/kirevujugup.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/minuweriwodexe.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8tsn7ta2avo912g5njlmeu9di4/80615652730.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/judedapewor.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/18052536287.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c77d7f0f---zegorax.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50801f331---wegudevozenoxe.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/b0vmi6ar78irb2bjaimadam0ep/kitovore.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ctrom2eorq05is1j9n27v748t6/33833838332.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e60314e5c437af594b54c21129eb5d47/nuwiw.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/tawakobewovov.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/49504960317.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/rakigokuroda.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/kizizodanizozodusuduzesa.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8bc2d9956---96208215945.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/af37af74fd6a3030886e25d38a0aa13a/10499377343.pdfIn PDF document text
    • 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_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 17196 bytes
SHA-256: f45f64d297885b082753a11c86a34adeb6aa75207f766392740df2e6b1a95591
font_01_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB1 10752 bytes
SHA-256: b0ada37adcff4f6645850045e7ecf72c841c2afc90555e4f80d6416e2493c391

Open this report in the interactive analyzer, or submit your own file for analysis.