Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca8ce1826d60fd4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 16:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4130459d5f11a8e7420a6f693ce6bf1f SHA-1: 3cfbd1a69d2db2d4ab47f10bb6d25a5de66a2636 SHA-256: 6ca8ce1826d60fd4a756ef32239282ae526ecc46a64484c5a05783fefd53ce8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://huntic.ru/uplcv?utm_term=friction+worksheet+5th+grade+pdf PDF link annotation
    • http://sklepjola.pl/userfiles/file/pepoborisukisobi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2d651a5222a8f283129ea5c57a6f7bc7/31137178048.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/piloxipedivelurop.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/zutavedipoj.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/rulifasaresa.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ed721c951---jaraz.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/sarobujemaxalusinawu.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/i7omb4cl0c6m8pun8mqn9ovnn0/vapewesadoku.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/goguvaseputaxikediwowalik.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/kotipifupesilinesipugido.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608165463bb0f---nawali.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4463ad84a12160e906b3176431e1cba8/jumog.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/gitabedigapebewutez.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/vevegopad.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609045bb2668b---ronugorezowubimilasugopa.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/5018382390.pdfIn PDF document text
    • http://0930actress.com/files/files/92118381854.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/40149319659.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/nveihlg618oqk53n9m4me0hu43/bogulemorig.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8a46a1643d48087351b7df26d4642f6f/885178919.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/nawit.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/vmec9kend8h7e3sio2m7ok1fna/69796083041.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lu8ubi2n30hom92thrcg31f8d0/8508144834.pdfIn PDF document text
    • http://12shio5.com/contents/files/vikofisaretadekukudo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qln83422qpa3fdu797kt73utb8/tefogifezazixovesa.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/tadulazaxe.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_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 17448 bytes
SHA-256: 49144ee533d3b0119de8b73e98d841fcb2807020c5c50babb790aea13416fa94
font_01_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 11144 bytes
SHA-256: c73d158f8dad99156a230f1c0d082d87c85031bedfab6dec442dc092bdcd8f89

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