Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c822093061fc016…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 16:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96df146a903748304c6dcabcabf82962 SHA-1: b9528cb2833940c1a0bae2a2508f634f75128f93 SHA-256: 2c822093061fc0161113ea038440a0ee5e4d936b4edac71d54ebee1295a196f5
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://markmont.eu/editor_uploads/system/files/66764668436.pdf
    • http://xinghui.co/upload/ckimg/files/202109101823472803.pdf
    • http://rotang.net/userfiles/file/66835650589.pdf
    • https://hahapediatric.com/uploads/files/202109020157078894.pdf
    • https://sunkamalzemecilik.com/userfiles/file/42080243612.pdf
    • http://safetruck.gr/images/file/16021052100.pdf
    • https://miraclechuppahs.com/userfiles/file/63739969848.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/posukopufamitipilize.pdf
    • https://yellowstonewildlife.com/46221081562.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8ecd654c---92439346850.pdf
    • http://land89.com/ckupload/files/kogidilamaro.pdf
    • http://teresachild.com/upload/files/gazededalunojeleza.pdf
    • http://mutitar.com/user_img/files/58327237425.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5da5699f7953cb6e58c0f6d77b587972/lotemiraleged.pdf
    • http://innospectrum.eu/hirlevel/file/xenovivik.pdf
    • https://distriparkbotlek.nl/userfiles/files/powenazade.pdf
    • http://fizjoactiv.eu/Upload/file/70684507171.pdf
    • http://gaushalango.com/uploaded_files/userfiles/files/35715469044.pdf
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/56750572747.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bf63v8ac7i4d6hg6venueevuip/88403682010.pdf
    • http://xaydungphongphu.com/uploads/files/xuzipupedata.pdf
    • http://usagimatur.com/files/others/kuwisuse.pdf
    • http://pedraferro.com/files/files/rasenusuvutazawiwosukimak.pdf
    • http://melly-incendie.fr/img_db/48051999468.pdf
    • https://mihalex.by/files/files/wojotofigarizipolidak.pdf
    • https://photojet.net/userfiles/file/19243269242.pdf
    • http://huyndaicaudien.com/upload/files/jupifitamuzal.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/020bcb3aa32089c706d9980b64697f40/dowixusafedizudoreme.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+install+a+new+app+on+firestick
    • 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_off0000c08b.bin
f61aa7877ae8f56c9a76eaea8186f852fa6a0ba2c3e13e4542e66cdfcaa92f29
pdf-font-stream PDF embedded font (sfnt) at offset 0xC08B 17572 bytes
font_01_sfnt_off0000ee67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 16792 bytes
font_02_sfnt_off0001067e.bin
b05c6945c0a47e35ced6aea4c8842eefc98f6adef32ebe821ba4100d79acfc9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 10640 bytes