Malicious PDF — malware analysis report

Static analysis result for SHA-256 be850bafa5b1450d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 06:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 527eac83e14048d212169ced1c55e1dc SHA-1: 94de3d6c32e5a790f0afa5862518d49c1d3337b5 SHA-256: be850bafa5b1450d943deab3155a4feeb3caa7a466f2d87a3df1a410ac0c6bca
164 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple disposable hosting sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to trick users into clicking these links. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://akkoryazilim.com/userfiles/file/87377514979.pdf In PDF document text
    • http://tyextractor.com/d/files/jafasupa.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2ke0r3ba1p9glifunoegnouvf3/zosog.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/um2as6pn7q9rl3tid91e29r0u5/39600353739.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/51450004253.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e1f2ed02bafff3ed537539042c0b9bfe/basedap.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/nojomalusawa.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/33565493662.pdfIn PDF document text
    • https://virker-ikke.dk/files/91761585476.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2904d909---34309098215.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/4139835712.pdfIn PDF document text
    • http://envigest.cz/upload/file/41195956020.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/86712086438.pdfIn PDF document text
    • https://begili.com/uploads/image/files/59885288387.pdfIn PDF document text
    • http://ombs.ru/uploads/files/25577254827.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d60333a7b7---pumisosajefizunagotovawo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f579fbaeb9---74961193858.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/letomulezojulozowi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fe6fa305d549b51aa103cbfb3f71a997/74202537836.pdfIn PDF document text
    • http://dzbnf.com/upload/file///pubosofanomowumipowej.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4f9o64fkbsqlpvbs3bh6ai23m6/napemanolapelepibaj.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160db2e40d2ca5---zonakejuwotere.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xumaxadefim.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/lezegikojime.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/zudanabusafitexelukaxala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=adding+mixed+fractions+free+worksheetsPDF 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_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 18872 bytes
SHA-256: c5e90fdb437dcdebdda03f15e34a301eda3b86d4e55239ea2d2d59d90191845a
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 11140 bytes
SHA-256: a7f08c43da012b20e8ceaed67ec7b5c6a7a9fc7b0bff1432a3f4ea9fc2d00b52

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