Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c83f2d6fca79a6a…

MALICIOUS

PDF

98.6 KB Created: 2021-07-09 17:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 876df70e4f7af70a03a310fb5f00f355 SHA-1: 75f6ab86f280ffc9ff35e1250a84c9bc72545155 SHA-256: 6c83f2d6fca79a6a63df9bab341cd887c983da05ce56e08e99e19f7601051f79
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing a fake browser extension or update. Numerous embedded URLs point to potentially compromised websites or link farms, likely serving as part of the lure or for hosting malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c78cb38fb0013a2b682188c84954bb5d/mezojiletoj.pdf In PDF document text
    • https://parklanehotel.asia/userfiles/file/44802878076.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8dbabb2c05357d6b9d0140d1067a9cbe/605481387.pdfIn PDF document text
    • https://digireg.pl/upload/ganotowufofenuvo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3c51a3750c24e418a1e76834dcf9a61/nufowo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/kkte15i4llktjt3ir5e36l94sd/jizonumukenofino.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f84c53a621---nigetusupegekeki.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/21552357719.pdfIn PDF document text
    • https://hirurgija.me//files/sagedidedoxox.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/30488730562.pdfIn PDF document text
    • http://splogservice.ru/content/file/82828413109.pdfIn PDF document text
    • https://zhansq.cn/upload/file/27522775577.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9a93fd29---derevixazejigova.pdfIn PDF document text
    • http://beiks.info/public/file/37777425295.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/39300427607.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a3b1c55c---21792307395.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef2f0c4646---kisuwokefemujoderidodobob.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vp5m5utk6va80e7r7t5i9honc6/13598178657.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9dc7b475c43a34b1c9968e798394482b/62878141905.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba145844e4f---kusexevajetuzekiritida.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/mifipobika.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/likolugub.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/71032237405.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/62459512918.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8c4cc826f74fa78b354694d3d66ad779/37982607858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pepe+the+frog+emotesPDF link annotation
    • 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_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F6 10400 bytes
SHA-256: 3962d62279e68aa7d29e1488e852fff5429f7d66e7c9f7bf434a02786aef1f79
font_02_sfnt_off00014d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D86 18204 bytes
SHA-256: 102cb2af879c9e7cce55458a03889a585ff9eb3019356eaafd105bd6e09f47a8

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