Malicious PDF — malware analysis report

Static analysis result for SHA-256 c463f176963b9158…

MALICIOUS

PDF

93.8 KB Created: 2021-08-27 14:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78ffaac87f7057c6978a22cecafae7e7 SHA-1: 2910717491e5ea5f251b875954eb7d8465eb5ce7 SHA-256: c463f176963b9158de4c1c06db83515fb5ea2db25ad8d5b3be53f45ebde5b424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs suggest potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://infrive.ru/uplcv?utm_term=yeah+and+yay PDF link annotation
    • https://abugfreemind.com/userfiles/file/linunugozazoroxora.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ae6583bd---vakixopapiwowidabigabimeb.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/oopcclln9ja1fmego5efrs4r4c/lodanogatovilowipik.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/57232135755.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ade3662ad50924115bfec104d9a35b3e/29576090351.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e832ab1730e---51816798222.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/67755245566.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1454940597611295bb9ffcb.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30562344734.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/np83bt76i07ttqb8vio379dtae/wilebenixafatatunox.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8sfcsbt37slmabehofol1tv5q2/96648260582.pdfIn PDF document text
    • http://sport-way.ru/img/file/putaperadozawo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a988876cac1---85304427159.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160797bfed6e1f---zumaruro.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/40984859591.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/tetitufipa.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63905470964.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/88407224024.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/38139065575.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/vupererewatosiz.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75a3dca8e---63438061179.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/14605ebf67969bf1de163a48e3391300/dudani.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/rojobaba.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a7b1a84f6ed0fb72563fb6b1f12a15b5/16583839725.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_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 9816 bytes
SHA-256: f4d93f8d4107f58ac3863889bc383a0af603ee8101598d7034f4290797b04a71
font_01_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 20280 bytes
SHA-256: df58f37e6ed1e0cfb570573029a386c9b93307eef8acde9aca240bd2120a2c06
font_02_sfnt_off000150e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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