Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f42cb812d4bc4b…

MALICIOUS

PDF

68.0 KB Created: 2021-09-29 14:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac2eda1dbfc52b9979351e084793d6f6 SHA-1: 9dee0dba64e216b55e98d55ff27766a4cea85f8f SHA-256: e2f42cb812d4bc4bb29710ddf9f56c590cd8b1a77df80c1898598fa5950b6f3d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which are hosted on compromised websites or point to link farms designed to redirect users. The primary attack pattern involves directing users to malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ketchas.ru/uplcv?utm_term=rangde+movie+online PDF link annotation
    • http://studiosaletta.it/userfiles/files/pegurezupuxojelu.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/babefomud.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/dowuwakirojifune.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/winopuwofajubabog.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd190cf8b5---lolepuvomubofewabun.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/warope.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/31675135286.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/65408526516.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/womororakowivaruvo.pdfIn PDF document text
    • http://co-mit.com/uploads/files/61035848806.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d03f8c517d2c8e458c8683fe9f3ec657/mixexokajateremus.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/fidejepijefidori.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/fadorodolu.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/xilimix.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/wujevomapisegebovezikux.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q1ga7au50m5fpl9qtunp38v3cr/kolosesovufagonolijofomi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/xagisavexofuz.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e66f89cec4---simafirebemokizaxe.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/86298135796.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae85301384---luwebavuzalezaberese.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/2392947247.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/zoriwalamevumefogituwa.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/dopupizoditoso.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_off0000adf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 10336 bytes
SHA-256: e60f17919d6781f0cf048b322ee509f7176ef0d92c481d88378349f491ae0fab
font_02_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 15168 bytes
SHA-256: bb75f15a162dfa2a875f3c954ade2ccff5672a10fef4d236d8250ed789970295