Malicious PDF — malware analysis report

Static analysis result for SHA-256 310d7e9989160bd9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 09:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a49ce52809004c9dd2980fd12a6ac24d SHA-1: e2b1d0d25c6d32b39381c80bcce04a011011fd32 SHA-256: 310d7e9989160bd97557b8a4314771be00c55d6bcfae5492c2fd91c2485d348a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the nature of the document as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=ifruit+windows+10 PDF link annotation
    • http://fobas.cz/userfiles/file/98456444831.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/67354630485.pdfIn PDF document text
    • http://royalgroup.at/tmp/gupiginirovaxapofogunera.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45284d60f---5005422665.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/rivuwuluzifovemuzos.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/79996858611.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/92531936914.pdfIn PDF document text
    • https://petikdaun.com/contents/files/42334318348.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2db315136---juzibowowime.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/pukupafedaw.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/18735926714.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/vedokuk.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/13668320381.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/bowokapavalibavaxoj.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/1991108168.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/99576237593.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8913235778cc9a4ee9acb2409e95af9f/vaduguziwiva.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/30929827372.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/94997397319.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/ramiled.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/josebuzanovepezuz.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/xuzosavowasinosuxef.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/1520202119.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481daa2a969---riteruraruje.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/fexaxavaxovevoravupevux.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_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 10316 bytes
SHA-256: be4269f7bc3725c2eb85d0de889dd20ee2ea2407240373d27ded8e4f9df3d28a
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 17196 bytes
SHA-256: dada07f08de0d3049266d1a5d8ea09da437d55526740a2877fc68561872973b0
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1