Malicious PDF — malware analysis report

Static analysis result for SHA-256 1282cf0762430cb7…

MALICIOUS

PDF

86.3 KB Created: 2021-07-07 07:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cf68e3375220d82b9eae82d8c51ffc93 SHA-1: 4238f6372b2ab2d2cd1fdfd1678193042ce611ab SHA-256: 1282cf0762430cb7ee749b8f8e783983a0aff6a873f6aebfb0b94d91bb3f06c5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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 https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0636d0998504507b3c63249bc8956995/baxorofimeloti.pdf In PDF document text
    • http://rts-3.ru/upload/files/nawagegamitakute.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pipoxukevufolegeranoxade.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/zejexufipedo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5b5b29cda09f41f810a51e76d2e3a0e6/tipabumamudoxarinunagita.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb21a66ec8---gutokanadigudejowenugu.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/19866974097.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7555e9759---74433208376.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/89333020073.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/zilezilijifawuxuxunu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/34944579471.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/rlrh0jqtae9q77ji9p4f7ccbgg/wuvemujulonejari.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/cieei6d7usso1i40q57e7j24so/72476142650.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2d4a4916---bemusifegazijigiguzerar.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/40ebfec15967e3ae344bf0eaa24e74f3/36094953890.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1c5qrpl6jnqf9o0hm0csgeg6f4/jemixadefexobufonefevoge.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/83a70a771333e8965553e5700c6bfd63/wefasenegozudo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb416134eb---96538546145.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/benejutesoz.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4265f3e90267cbc3384c8747cdfab0ba/26722980105.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a76b2358d---fepabo.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/xobigov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=girl+names+that+start+with+the+letter+nPDF 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_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 10380 bytes
SHA-256: 82b8ac28bd9127f52e49386c368090a13e83f49a72fa9c271d3bfd1d77559494
font_01_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E77 17492 bytes
SHA-256: aa828f261554b21109afe94c406d0e23892c1c2624c48fe65d596f768bd908db

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