Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb5ea0043acbe78…

MALICIOUS

PDF

85.7 KB Created: 2021-08-16 22:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7301c305c212a2b803e52b7ef6cf611 SHA-1: 2bad872bb50121df1116e16d30baf38fd5cdd6da SHA-256: 6eb5ea0043acbe788f28fa55ede5e17b32a564c9769ef0d0aab6404ff264cd96
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=how+to+get+unlimited+robux+in+2020', suggest a lure for users seeking specific content, which is then redirected to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9344

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://pistant.ru/uplcv?utm_term=how+to+get+unlimited+robux+in+2020 PDF link annotation
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144a41461c1---40812931718.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/lonezoxizepi.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/fd92c9a5a77421228bb1b7e2c90c1437/pazogelavezeditofaxetime.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/36088073701.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/luzinolezubokerovenuba.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/fonakome.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/puvolosadewaxeto.pdfIn PDF document text
    • http://st03.it/userfiles/files/vilozobesitomu.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/98401111769.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977dba11207---44693668243.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d5c751bcec6735bb8d38290acc562720/bopobunegopeva.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edd1e54385c---wonuj.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/kasakidot.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/46390566052.pdfIn PDF document text
    • https://arerp.kr/data/file///zovobadupomaf.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/24288072058.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/25449894009.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/lugorusudobavogawabep.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9e7111d4---36132243578.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v1onu6jfdfkvpujt4ol8b5qqp3/kutukikejujok.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/welaragakikawozotosodowut.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/51714981571.pdfIn 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_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 16696 bytes
SHA-256: 5a312ba4ee9e55e517490c64d9eedb83f743630c73c83fb59e2b58ec3afbac7f
font_02_sfnt_off000137b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 10920 bytes
SHA-256: 2298004b2d6530409b3aed1a0c955ba974fcac6fdadd59edb2692643f71f4ba8