Malicious PDF — malware analysis report

Static analysis result for SHA-256 802cbab7e8da07af…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 05:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c028f8a3ba3b74bc19d41bc65fa1ce00 SHA-1: 006a77434fa9bce82a5a67c1057c285bec3d64fa SHA-256: 802cbab7e8da07af3e1366b20ec0aec1a3e9e14216f080c1a21c8aae70ff73fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly suggests the document's primary purpose is to facilitate access to these external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=educational+vocational+guidance+and+counselling+pdf PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69e07253df---kuguponi.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/fipexepabisobijolabo.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/55582650153.pdfIn PDF document text
    • http://wfhs64coyotes.com/clients/b/bb/bbaa54d3a7800b2058c5658261a6771d/File/xalepux.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/1974460853.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/fujoluw.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb4fa4ea5---goragidoxitup.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa95ac4d63a3632e4cdc1d0c55a7b453/sisilodafovigesuriwekefup.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/xexapojujovijipi.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/noweteganimin.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c3a258ce4---89217250585.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/525e1627a59331e7cf2ce99e402b6c69/96155427039.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/lapajolibutazedenopoze.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1a0f578ac64047f82e40f087856b3dd2/29566103287.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609831fe8581d---43163790661.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/662241672.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/73255774032.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f9dn710bqpojtv3nkbif9b16n/46628692892.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073aefeb303b---43072812926.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/tiwuserokajafovalarutew.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238de594e4---91632171135.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1ba22d3d3---sotabitesikobipubisus.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d66283de7---roxevasupipinajiler.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/82532071178.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/4285000100.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_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 17328 bytes
SHA-256: 4f655ffefc8bd57173f5f98d15b8f68fb16175edf7d4554005f75c5655dc6e04
font_02_sfnt_off00014a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A33 10844 bytes
SHA-256: 591965286c2aee7221fc5b7b8a1a7636e7e5ee41db55745c85a8f0013245895f

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