Malicious PDF — malware analysis report

Static analysis result for SHA-256 602b5ddc50cc9a5f…

MALICIOUS

PDF

83.9 KB Created: 2021-08-24 17:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2ec3471cef4206f7bb06fc6b2569385 SHA-1: 8116255375a6c8f91594c72b56aaa19543d6935e SHA-256: 602b5ddc50cc9a5fcbb8c7259a2b8b2d84fcf180e832a64926718305e4c98aee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=bhut+jolokia+hottest+pepper+in+the+world PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2c5a090c---masudavigenufe.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/9536649295.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/99827586caf03bf1f949d93a3681a11f/tomexezuzodevoji.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/udqadvcfrsqbola8mp4urgua7s/5871526973.pdfIn PDF document text
    • http://grupophi.es/uploads/files/83798947838.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/7309260190.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c2beb042---dinixagevidokepabiz.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/74dcce472864ac2ca74b2cdfed6cc02f/mipazozogidegaxebi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/cd6a0e69b6d0c274509964369606e80d/94879387254.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/fisozesomorig.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/gilowonuluro.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021728122463489.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/1898725241.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/8073322133.pdfIn PDF document text
    • http://slsnn.ru/content/files/26245187825.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b1dc7b474---dotekuperuzixejogixeniw.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ad3a53925---ruxamoz.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/dkm8h9jd26qaunmjsfqbkebc2g/52505048374.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/ridukuzogofifabifawo.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/31114793815.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/54515108817.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2f6a77f8f09fc8645fd9af1346fa259/74140720487.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9fe6607d3a96e4b3f045214dffc4c383/97822027246.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ea7cb009---35460507666.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_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 16864 bytes
SHA-256: d55ad2ec8ccb57feb776c28605b7b5ef40a4edd85e8b98015ba3de518ed2c26f
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 10948 bytes
SHA-256: 5c965ba8bf946bc34502c90f8cd55033724cc1c721a51f8b84f212abf61b3845