Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3382dcf357501f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 01:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10dc43824fa55e110f4b26d094730831 SHA-1: 60baca9e0c07f40854283b76949460da879ebddc SHA-256: 7e3382dcf357501fe8b944a2f541510fac1eaf0094f6f5eec947526238278d50
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=emergency+trolley+equipment+function+pdf
    • https://balaji-technology.com/userfiles/file/fivunimiruvofefo.pdf
    • https://ilmercatinosottocasa.com/file/46153254112.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210710_193637.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609603610d174---30574929044.pdf
    • http://eska-lift.ru/userfiles/file/kadopabivixesebikuki.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4884b959ae---minaxepe.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/15229aa8289cf07ed56a5dc4d4564fcb/tatubodut.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac72a9f22fc---mugadoroxele.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/87277426713.pdf
    • http://hutergroup.de/userfiles/file/25904966783.pdf
    • https://powerliteaac.com/userfiles/file/98216685050.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607693a50eca5---74082324461.pdf
    • http://wellfoto.cz/pictures/files/misozifozafo.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f2269b8o6j7g6d6pq4fsc9cd1q/82438969166.pdf
    • http://grupopiscis.com/upload/files/pudevujefisowituxogaxep.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/q3csuak7sfopmimqmaa5n4pdff/lamabesuperupagiz.pdf
    • http://astro2sphere.com/admin/images/file/gaxebaxoxedegebota.pdf
    • http://jeykrishnaclub.com/images/file/xutepuwevanonerifos.pdf
    • http://gshosnab.ru/userfiles/file/tojudofojaw.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/80234748260.pdf
    • http://go-pxl.com/uploads/files/vunoxofabokejarevagi.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c5620637330a515908d7f62db091fbbb/lumad.pdf
    • https://marblo.com/app/webroot/img/files/73175506561.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/juvebajegikulixefe.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_off0000bc36.bin
7b9a092b3db34e9d659c7996aa1b015b400f54e457eeef30a98d05d4da1438bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC36 15976 bytes
font_01_sfnt_off0000e53b.bin
b705a3ec42e32ea10ba30e620ce12b00425bd2e23a6229e68d1f4479f46f9dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 10976 bytes
font_02_sfnt_off0000fe1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 16792 bytes