Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1192554cdaddc5e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 16:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06f0df978962bb8eba37c50ee383650b SHA-1: 0c5c5346bf5ff1d9ce279a042cf40cf49d9a7a6d SHA-256: c1192554cdaddc5e2d775b966f2f8ebd9931601161a157c928ee2948e9a61c32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external links, many pointing to compromised CMS upload directories or disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=magic+fluids+full+version PDF link annotation
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/54558040358.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/94684675385.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109022303045069.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/40403165124.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/26736060956.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/48714978516.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/cee7ad63bfb52def6d54acb822c712f4/rikotogixizimol.pdfIn PDF document text
    • https://anaksemut.com/contents/files/jixetoriko.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdb091f06---dizejijulama.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/xasekuxi.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/54385348644.pdfIn PDF document text
    • http://agro-partner.com/Image/files/14721491000.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/88affaf643b098ed737fbfc70d49c8c1/danigujusavunavamazi.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/voxepexivelewiro.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/42942013815.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/nadimuverisoduterove.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/riliwatexevovekeponawem.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/gusajilowuv.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/82580803302.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/wumobemajovujojisibaluzox.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jivaxefib.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/dasirapob.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/sofumanebajaguvivakid.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/nipivadukatusutiniparu.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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 10712 bytes
SHA-256: af53a8432137656890f77d183db6f7d20c0b141984feef2dcd65b8ceb31a1e39
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 18832 bytes
SHA-256: f1fcda2b7df46917f34639d181b138f068dc76bb06d952aadfcbffb777866572

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