Malicious PDF — malware analysis report

Static analysis result for SHA-256 329b06aac5998ed6…

MALICIOUS

PDF

81.1 KB Created: 2021-06-26 00:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba77ff853873308af90706403c43fe69 SHA-1: f5681e231b2f3e0257355afc9f2dfdf54b42eb79 SHA-256: 329b06aac5998ed69110cae142e03d4e3dc90065d6b674a7c5e8ec3ace333a85
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the use of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synodradomski.pl/userfiles/file/47066539824.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/afa8be03c90608abbc0226b152df7ae0/nivexolawi.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6879cea296280025aa630e07fd07a700/waguwubut.pdf
    • http://av-jet.ru/userfiles/file/56607209914.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/munefedigofubaji.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/nogozuselipitaxuwidota.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f23837a470de0e66b0b455529b4bb3dd/70591940816.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc654538a---dates.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2682bd77---32369722496.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5022035d2d74abd15d896145681b4833/vivotudoribezenadudeveko.pdf
    • http://ccspatti.org/userfiles/file/1472854511.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/db079c894a383e105630120dc5145f5b/46617081914.pdf
    • http://viewcs.com/partner/upload/dextfile/10364650438.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2c81705e---23984001535.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e4f88238ab5df10ed15882b5a3e62d63/goduwupivilowe.pdf
    • http://chinazzjx.com/d/files/34451816830.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/7d9f0286aedf2006339d9b9d242ff086/3465018707.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b0438f190---loxefup.pdf
    • https://mariellatriolo.it/public/file/73064311148.pdf
    • https://angelsforwarriors.org/userfiles/files/resebakoniteforogaz.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c686b148837---67226117876.pdf
    • http://ankurgroups.com/userfiles/file/8391169874.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=word+connect+level+121+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 16792 bytes
font_01_sfnt_off0000f1ee.bin
3a9860176359647990bddc1bb3d7cb759472516f362d1264a379fa57aaf57ef1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 10588 bytes
font_02_sfnt_off00010a6f.bin
43e626f118fae75928532ff6e42dc727a963a404ff491b667faf29f223f17b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 17364 bytes