Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fb6a7d47c8df5b…

MALICIOUS

PDF

91.5 KB Created: 2021-06-25 22:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14d55cf206e41485cac6017392ae9d9f SHA-1: 3edc6181cc6b4fcc38a646f4419dfa128e82b3a4 SHA-256: 41fb6a7d47c8df5be0d9a90e131d435b2cdf57d6ad51bbbd3aa6091ec88f83d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of multiple external URIs and link farm heuristics indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad11a160f8c---78707176953.pdf
    • http://hi-techfiber.com/userfiles/file/nunazalawi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iht1bdegnj0gd6jueav03hc65/49890926275.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/78942829558.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/97m517d6mu7tdcgt17bin55cnl/5318763612.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4abmluiv9dng47o4h7gddapqus/tadosovuxuxotuboruzuwij.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/892c9v9csra2tatsg4t9sqq2ko/xuvubekonumurunegadosig.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/f73io186dvkbekagalb2o6tfur/kexijodulapudukewugaxuji.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607712331ea44---dixigizexedibaxafur.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/vbtjt4l4r7lp1731eee084mam0/38032011896.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e9197a7a93ae8b0129d906468f51ab8d/68349739906.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a740f143fc4---sawatefepavufinewikos.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865caf395b8---13065803417.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160866983501fb---40908863892.pdf
    • http://1959blackshirts.com/clients/866684/File/8171180666.pdf
    • http://nfc.soo.jp/file/97052708923.pdf
    • http://cuatro-pr.org/sites/default/files/file/71775440879.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/80d0d2da8f3dc1dd4ed1ee43d7ebb2d4/gagaboladet.pdf
    • http://klinok-saintp.ru/files/11600333324.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jfi8k0ifpauj1p5j3qh9fp8hjf/donesebod.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e5f9b5bd4---pelupilovalajikeluwevade.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210616_44B4FE6AF32342F0.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=new+haven+ct+land+records
    • 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_off0001020e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 16792 bytes
font_01_sfnt_off00011a25.bin
ac538f1fe576d8c2f93873fcac2a0d157cabb6848dfffbf0421636e61fdc55e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 10504 bytes
font_02_sfnt_off00013213.bin
6cca071741658cd460e07917a5a738e2f500138f86d6ab6899ef426da86e6c6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13213 17792 bytes