Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e22bb3975473e0b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 10:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e882519c702cbdfc805f4b5068f18886 SHA-1: c3193f73ad5d6300bb5a4d16603a8ba65348fbe3 SHA-256: 6e22bb3975473e0b352b06c9c9bf6604c704d5f1cc051c104f0c505296460820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, with external URIs like 'https://infrive.ru/uplcv?utm_term=ig+gb+apk+download'. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=ig+gb+apk+download PDF link annotation
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/jokemibemarosekujese.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132a4d72ff20---sapelibubibepirujo.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a2a3fa01851f3b5acd074a7fae3a10fc/tovewoxagil.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/76153930891.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/xesinimekofedosoreve.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/44798849496.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/xaxik.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/56101120447.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/71785611533.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210919_B19620FB2F333338.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/nupedaginupujel.pdfIn PDF document text
    • http://sial.pl/galeria/file/kopaso.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/42525712557.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/wunuvebosumig.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/luduvimufunizinofijuzud.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/76731476899.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/52082575934.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadc8608fa---lobugiwav.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/zitesuvelirefugonuxiv.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/85645644570.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/kt9cmpgotmqi15qd2isi4n81j3/nesatezogijorara.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/88807287402.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/l5ecqeqicgpiiqusj5vvniu6q2/xabudogaxixupidowutilaz.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/60224661514.pdfIn PDF document text
    • http://bluebossa.pl/files/file/vinokukavo.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_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 17724 bytes
SHA-256: f11d931751b8f111ed196da3bb62c72adf4a3d102ea03cbfb7ebbf4ffc18e563
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 10244 bytes
SHA-256: 5635f7d3013cd1a30bc394c4ffc59e8a6c668c8790e87d22d9968a45a2cdc77d
font_02_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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