Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecb5f87e81c7661…

MALICIOUS

PDF

73.7 KB Created: 2021-07-16 15:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9cf53f6c33bd44494c2544077b2dd90 SHA-1: 5b024135e054040039ebff10afcb94dd7090430c SHA-256: fecb5f87e81c76612644bbdf3d904e272fca0edf075276ddcf4cafeaa94bc706
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through social engineering or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://builderall.info/userfiles/file/gerav.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1e3a594c---9338355068.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/97104311533.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/41312d836baa58a61c98ac30e877e0ee/24816599747.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a28557f3ede---28424328794.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/486a202a4a07ff6fe82ad21b3c539064/85580933507.pdfIn PDF document text
    • https://castel.ro/userfiles/file/99497395006.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/vokixajoxiki.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/rizoropusumoxisopum.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/nowavuzopezejukorejevov.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210620095709.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/82803639d6125bb3af446b6586015851/gunoxavoxekijuler.pdfIn PDF document text
    • http://asfalon.com/__files/file/bizopiwivezaxaru.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429170835613542.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b2879683---wudusowaxikinezog.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/kejinu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e8316039---guxupufozojipupupufax.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0d55c106c67810611b014fc665587b17/wusivemomupogimenuwobebi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e2d9bc82---19406653291.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/jugetolekozunozuw.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7edf9247dc---39814403594.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/16900284693.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/jofudimazadanof.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/vopaguveke.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fenajozogavimiranoliti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+structure+and+function+of+nucleic+acidsPDF 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_off0000be52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE52 10636 bytes
SHA-256: f7d4a3212d80db75a4388f9165b0fb522abb5200d478ef692eb5a3e6238231a9
font_01_sfnt_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 16460 bytes
SHA-256: 7b7ccba9b1ff05074ffc91738b31496004525c128cad67fa4e09e6325441f19f
font_02_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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