Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8631cb8b1faa40…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 16:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26726308dd7a6300285e3ace16acf6fb SHA-1: e67480f4ed6f446b51c5776c3855b7ca0f9238d5 SHA-256: 2c8631cb8b1faa405b5fddf6cbb864fc2943d510ac85e33ade2163b970655ee8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://pobierzplik.pl/uploads/files/55397470017.pdf In PDF document text
    • https://drjou-vc.com/upload/files/kururupopi.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210916101107.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/66951404073.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/munimefigebalexokexexe.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jinuku.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/tapesibaxujukatekodudotuk.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/509895e17b5cd30c39cb39748219ee75/jezunoje.pdfIn PDF document text
    • https://afma.pt/site/upload/file/80330615002.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/womabefadage.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/64c08c8c6a15a1246bd8ba5f689523ab/33765309393.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/30673080276.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/tixefiparudoruwuwefuzeda.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/95588229859.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/fipaborima.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/bolanixudibobeje.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/55186699591.pdfIn PDF document text
    • http://hangquangauto.com/files/23576874798.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/32675856276.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/bavipiwinaxam.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341f8964719---wulatabiregepiletupi.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/kavogararebepunusej.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/57938992509.pdfIn PDF document text
    • https://cargotavio.ru/files/file/povoxizaxopawuregenoleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=app+angehalten+androidPDF link annotation
    • 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_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 18548 bytes
SHA-256: 3e87e38f02866f439ca45d925e97bab16f688bbc1edcb32beb5abfca9bee7a63
font_01_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 10484 bytes
SHA-256: 5283ec5f502c0a2a927fd683dbcca133624ef695b50bc443eaceb29b60400888
font_02_sfnt_off00013c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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