Malicious PDF — malware analysis report

Static analysis result for SHA-256 639294912b12c459…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 09:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4fa7d2a3cbee0b5b6b455f911fcc69c SHA-1: 171937c253b7b3fbace719ecc1df3b6221dd00ab SHA-256: 639294912b12c459cd30a65363d52297b8d20cafa7a4e2f7165705554bcfc1f2
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 compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution intent. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://allytemp.ru/uplcv?utm_term=how+to+get+android+software+on+iphone PDF link annotation
    • http://myapartment.de/web/editor/files/mutigevomupej.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/jugutemojemijag.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/deverugitukojimirojezara.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/kutotamenemarijagejoguj.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/66329998764.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/vatejonifulujitikazukoja.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/netetepofumirupepovo.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/45362162313.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/lutuvaradejakekozapalulal.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/42511796101.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/51477225815.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/94925919576.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/kofijukekefasa.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/19896457802.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/lojenavebidopufef.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/pagar.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/68695556996.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbd025628---tobufofisofi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613390af431b4---58542743884.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613262716780e---laletujaju.pdfIn PDF document text
    • https://biodez.lt/i/File/nomanetumotonoxatowon.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/57987153614.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/fazixosagoranovejupim.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613826d88961d---52756605017.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/totulojipetirowufoduz.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/kifaruzefufadebad.pdfIn PDF document text
    • 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_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 18464 bytes
SHA-256: 436b114ee7d5fdd717202f6915dc2ce3c70b5881b51e405033f59e76bf9fa574
font_02_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 10808 bytes
SHA-256: 2bac73536341de60df37ee44b0adf045cfc6d5b81bbdb4cfecd13b1597c8d30d