Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61a92790413bd93…

MALICIOUS

PDF

92.4 KB Created: 2021-07-07 11:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c2aa2e25d710fffc98dc83d600d9e70 SHA-1: d363856795e6a4d7b6a5b55ac87f7ae4e473a346 SHA-256: d61a92790413bd931762f4ee35b707a27ea42570bb54758552896ea07ebf9ae8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=why+do+female+cats+cry+when+mating
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/cbgb4tvvkog1l7tadqicr0g5aj/19577596924.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f3e48bc6---65037434888.pdf
    • https://x-software.cz/data/file/11381189029.pdf
    • https://yuss.it/file/54744021249.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9f30c592---28445741647.pdf
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/mawufujepupigozevapuz.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/2431817173.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/gbfb4bepprskqlj6nsnqt74p27/xudatarexutuwilikud.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c01d32c254b---69404351480.pdf
    • https://senhewood.com/d/files/52209640565.pdf
    • http://ecohort.com/userfiles/files/22045341792.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160841e26af6d4---gufoj.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7baf04b5---56549172233.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2311749a441da06c01378a83a923b21d/kenijap.pdf
    • https://lesfeesdelhetre.fr/upload/files/22468820055.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/20b9375535aedac83a207d0da65d41c4/84924349837.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/iujgvdiasi9h06salat7h6g254/pudiwodowupu.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/mqd0jh7lcog2avptlg5gr8bhqs/vebuxerupuzakapajaveb.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62df93ca5e---gezamolisedovubato.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed737175e2---penatolidedogigaj.pdf
    • https://burgas-remonti.com/userfiles/file/mimaludivatejef.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9d47df9dda2b2e6acbb648ab06b68542/80390704163.pdf
    • http://drivescuolaguida.it/userfiles/files/18456629622.pdf
    • 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_off0001044f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 16792 bytes
font_01_sfnt_off00011c61.bin
af322bfb633bb8bb948c538307b7f6dffde8a96141e597fd1f249c9d74515ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 17256 bytes
font_02_sfnt_off0001490b.bin
e4f06a18570879e5f96134652a7a5d78c035ecb5a44b33a2855537d271e9d9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 11116 bytes

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