Malicious PDF — malware analysis report

Static analysis result for SHA-256 792c9d4c97459810…

MALICIOUS

PDF

101.9 KB Created: 2021-09-16 11:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4beeb7d919b60569e326df4fe7a25059 SHA-1: 2fe8b0215268c6cd2f5e6eef25d8972ff82b7638 SHA-256: 792c9d4c974598101206fc801a8a540211420eb3f6fc8a53f9b79589151f0712
164 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, suggesting a link farm designed to distribute malware or lead users to phishing sites. The presence of a 'download button' heuristic further supports the intent to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://obkladacstvikolar.com/content/19678324071.pdf In PDF document text
    • http://sualpturizm.com/userfiles/file/86826232697.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b73fe2f64e9f5316c3cabece5c205bb2/95358376444.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/difubufatotita.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614119c733a7e---82906338109.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614018d30a468---14289866233.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/betavapagiriwalifemod.pdfIn PDF document text
    • http://dsagco.com/Upload/file/noberokalanililapoxe.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/xovijale.pdfIn PDF document text
    • https://yodobashi-church.com/bafitivivexilozid.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/92196739860.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2c12d4ab1509fb9de59724c96d9747c8/gararuzivuzomanonaziki.pdfIn PDF document text
    • https://5uempat.com/contents/files/nilikitavavilusizodivufeb.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/duvebada.pdfIn PDF document text
    • http://klhl.com/userfiles/file/60791190953.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/64084308701.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/suwogetejorugugupo.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/68067592106.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4cc04940---togusinujevisew.pdfIn PDF document text
    • http://apple888.vn/luutru/files/totonajegu.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/doleb.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/2775187219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+ball+tenkaichi+tag+team+ppssppPDF 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_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 11052 bytes
SHA-256: 891f4f10d1819c97effd1f774af2d2b7f9996597d81acebde434d6a704efe896
font_01_sfnt_off0001392f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15141 21468 bytes
SHA-256: 648e43038e9ba2649b8eff3309402a86b802c54cb03a56a82b5cd90809535e5b

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