Malicious PDF — malware analysis report

Static analysis result for SHA-256 451d47dc21218d4c…

MALICIOUS

PDF

94.2 KB Created: 2021-07-31 22:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 148789ad228cc29807516a6a677d814f SHA-1: 5fac93594f2997a3d6aca4d84f45b2f8b08008c2 SHA-256: 451d47dc21218d4c1816800c4b1c94d780862f08e29a931e90e4b1c19f1bb4f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://flexa.cz/docs/file/sasumozeneke.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3dbd41c92---10347825285.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f30f68805c---89642988746.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/11173491597.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8a929f0c2458c920cb08b44c451b9f6e/fegalavajenoti.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cbad9693fad0a65003df95df4a4a51f5/lononitokobokixotodajidol.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7e6d55f98ea84f217971f1ed47c0f766/pusesalumanumawode.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cdc8064b---xurigidakonusavaf.pdfIn PDF document text
    • https://mattress-leader.com/media/zenodiwezidemojixilewor.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vn63jadcnmoonufbg2rnhhl59r/68093461777.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6adf38868---23107359807.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078211e9217d---gopaxifebugu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/878a2a73d010be5412a9ebcdc11a63fc/4161281239.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/77098531266.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/venepakamam.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/nagagasadite.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/73415274340.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/5200413182.pdfIn PDF document text
    • https://paperland.bg/uploads/file/deladutejinupuw.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/49802540079.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/30603102012.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lba60cpn2saoujsnitjl07lg3u/82161789463.pdfIn PDF document text
    • http://fitviewer.biz/files/file/72123506320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=%D1%81%D1%85%D0%B5%D0%BC%D0%B0+samsung+syncmaster+740n+pricePDF 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_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 11528 bytes
SHA-256: 0c57d66d54c2069b162d9577449a9b92508ad77ba82acf54dbf58ddb729290ad
font_02_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 22772 bytes
SHA-256: 8706bd40ed7131a1bb9bdc31adcb59cd8ca41bdb36e64fe7432c3bd6c5ec7c7d

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