Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6ac49706a34c70…

MALICIOUS

PDF

81.3 KB Created: 2021-08-16 08:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6c1be34a7e82e1eaf2f9af888b4403a SHA-1: 3c10750706a155f4b0a4d05020850d2346c1c311 SHA-256: 4c6ac49706a34c70c55b7c5c69808e987980fe03de24c5af683e4c61dcf28f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=how+to+use+toastmaster+mini+waffle+maker
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/jugebafamijufikesiburug.pdf
    • http://commune-bourre.com/userfiles/file/40512058435.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55391266735.pdf
    • http://mamolenasnc.it/userfiles/files/98333085367.pdf
    • https://hinodanang.com/uploads/image/files/vexaxepakapi.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c19a2871b7---64460891854.pdf
    • http://wagnerpc.com/userfiles/files/49221358917.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/debfdec4108c22d3803057a72dbb370e/nazetazenoxow.pdf
    • https://canevastoilestjean.com/upload/editor/file/sisogowaniror.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcca67e42---61575260068.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/060f6fd1c76a749565d5366ea6720797/lubetawepasexof.pdf
    • http://feriaalainversa.com/uploaded/files/89984029941.pdf
    • http://jeyadhurgatemple.com/userfiles/file/95408180706.pdf
    • https://isleo.com/i_photos/file/dukuziganojakijizobejiwub.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e04879c27---fodixol.pdf
    • http://nextgenship.net/upload/file/20210806162827670118.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/atsgqr6daa9js32t2vrja0n88a/57771111117.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vibusowirineloketovunij.pdf
    • http://technoculture.cz/admin/upload/file/5405669558.pdf
    • https://tsegypt.com/file/ruwufizunimobokori.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/64447409002.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/kogokiviradigefoluvox.pdf
    • https://jokerprod.net/userfiles/file/81473635655.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_off0000dc59.bin
f03bbe8ce5aca1153a895355862a46d62810da440d99a3acadd94ce967f2f54b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 16520 bytes
font_01_sfnt_off00010717.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 16792 bytes
font_02_sfnt_off00011f2e.bin
99871913fa26615096044b02e7e51fc994440c15606bbe5a1705b8d0a7b7abe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 10644 bytes