Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c589ed97111f395…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 22:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 746cdcf368d757b7206befd264a7832c SHA-1: d6f69b8f79f5766ac3b956f90251d341045af078 SHA-256: 7c589ed97111f395088dd031b1b53b57ba6bc5147d0f8eacfe7aaa7578a38745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for credentials. The presence of external URIs and link farms indicates a phishing or malware distribution vector.

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://cructi.ru/uplcv?utm_term=separate+pdf+files+into+multiple+pdf+files
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af7cd1631d3---zowinuvedox.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa42bed3b---19476750244.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a489dcadde3---datesarekiwa.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/e0aef1nrbilm9inj36hndjad73/49315580040.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0kuloftfhbbmtvn53mui672090/judirosoni.pdf
    • http://bobiniauto.com/userfiles/file/jogazu.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191f4d90e3---59273773589.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160735ac3ebec7---vegamizid.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/duridevitakujonor.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7ffe4f798e059446019d940c3ed6c38c/bafinalaberujujar.pdf
    • http://rotarylaspalmas.orgdocumentos/file/67082197173.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0554946d7---dalenixub.pdf
    • https://folklorebridge.eu/uploads/pictures/files/144302619.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4d40706f47b06fcfa0871abea5616805/nepimagadu.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa418d27eb---vafivesut.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16076f951eac5a---vifowudadodujuvidere.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/simuzawupizexijoxafa.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1d7ac50a3578d05716ca2d5c618f8105/sokove.pdf
    • https://hotnews.md/upload/userfiles/files/71148464291.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/121fq510i4ullm8igabtofocj3/rinugasitoxif.pdf
    • https://summit-christian-academy.org/scauserfiles/files/38738558811.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8873afce0---vekodi.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/worobipipudig.pdf
    • http://al-bandak.com/userfiles/file/vezesejaroredi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d41d9b2b4282295505cbbfd7c10636e/lunojuzolule.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_off0000f097.bin
17bd737d69f589805980d7dd0098e7c6d19e357eea0a43a94d033b8322b8677e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 18196 bytes
font_01_sfnt_off0001205a.bin
3d57dae618579dced1ebe46bde69fc827a25be19acb7a13b47ce395f98f979f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 10832 bytes
font_02_sfnt_off0001394e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394E 16792 bytes