Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8192aad9b23f93…

MALICIOUS

PDF

81.0 KB Created: 2021-10-06 04:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 779c376514617f4187b2f1417063e07a SHA-1: 693a4e7649c0b6b3982903310a619cfa2a30a960 SHA-256: 6c8192aad9b23f930f881b49a926762d5b91114aa679a75695e7c176098ac9c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The primary URL, https://irlanc.ru/uplcv?utm_term=driver+easy+pro+license+key+2019, suggests a lure related to software licensing, likely leading to phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=driver+easy+pro+license+key+2019 PDF link annotation
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147fbcb530fb---kerizativifavolawamijifi.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/15542087487.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/74608774118.pdfIn PDF document text
    • https://computerzone.pk/file/varixox.pdfIn PDF document text
    • https://pmms-online.com/assets/file/914204739.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/xawejerepefilutijojukem.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/32086652005.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614642627195d---vawipananotegajo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614da53476e2b---xasizelafaxofij.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614061c9d6065---1170706708.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///92826710498.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/girazafanifaludadobipe.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/78655196857.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/83373678342.pdfIn PDF document text
    • https://advik.net/userfiles/file/75160266349.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/texewojoz.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/vuwawub.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/40496040619.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/tusatozijebuwifuvez.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/lomutikewoditoje.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/jevuwoxasud.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/xetazidogu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/9839330996159e6334f307.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/vubud.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/wojepagokuxivefuwuku.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/12608733746.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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 11004 bytes
SHA-256: b06233410f491a6e9c00b8843bb25aaeeb057d1682063eb12bed75624d8942e0
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16772 bytes
SHA-256: 9bd4987d7113e4e7ba134ca6d080e34171590c866b4b473d4f26bd038a243dcc