Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b3d1d6c01e9eea…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 12:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 973a23feaa688045ce8e11d4a8d6526c SHA-1: def134b1bb554e885d1ffaf06c94f3bcae512a16 SHA-256: a0b3d1d6c01e9eea20f14a75a76b5c7d12a827545807ad50ff994eea179a1e5c
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to execute a command, likely to download and run a secondary payload. The document body is truncated and unreadable, but the presence of numerous links to potentially compromised WordPress upload storage and disposable hosting suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://djapm.com/userfiles/file/9080266615.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/65cb1fa0063601ab93343f25e099baea/pibewojew.pdfIn PDF document text
    • http://zae.me/datafiles/file/lidebamowakim.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a687ul0hv4d7ohs3t9h1bfksnk/21767519495.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16130d96f7f5fd---diwafuwexoma.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/kidokazezejetok.pdfIn PDF document text
    • https://csn-alliance.com/data/files/kiginikegazovudaxesepagof.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/19310351130.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f1594ffe8ca9bc43f6ad32a5356f98ce/lopoguvopudexenulaxumofom.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/25466974111.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef976e1b7---9987426282.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/kugeladalivomanuwukamesip.pdfIn PDF document text
    • http://sungder.com/upload/boxokoxojavofenozoda.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/61464582842.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db781ee4dd---sisimivukenug.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/fegutesom.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/72990993903.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/50602628291.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/nadab.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/80005501942.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/kuregosovenatifo.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/supela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cast+screen+to+mi+boxPDF 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_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 10616 bytes
SHA-256: 732c2d0c060dfd5604b41bd99171fc707b82efb442a5106320060497c2952fe4
font_01_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 18628 bytes
SHA-256: 5ba1fd2e02c707a14bc8b770eeacab400d6acd1f2649f33a889905425867c1fb

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