Malicious PDF — malware analysis report

Static analysis result for SHA-256 8781e1ba1bcd690f…

MALICIOUS

PDF

67.6 KB Created: 2021-09-28 16:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75579e45cb563c03ce59856accce3938 SHA-1: defcc7acad61a03072e0901e18a3505bde2ada33 SHA-256: 8781e1ba1bcd690f3b68681dc535afce697f9e2a7a74fe54d7ba8c9f43eaaf5a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to drive traffic for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=start+with+a
    • http://gesht.ru/admin/ckfinder/userfiles/files/44961272002.pdf
    • http://twtime.com/uploads/files/202109100420138521.pdf
    • http://fixafilm.se/userfiles/file/kepotolaragifujunuvef.pdf
    • http://miyozenemeryville.com/uploads/files/nigadurisoj.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172052e450---kejuletilad.pdf
    • http://farmaciafici.com/userfiles/files/gumomuwobo.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/junovoviligafetevuxefama.pdf
    • http://xingyeknitting.com/userfiles/files/basaxa.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/nefoku.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161424efa73c03---90303028426.pdf
    • http://vlajkylevne.cz/UserFiles/File/jagajemajaxotupidit.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614083e96f89d---bamolinigetosaroni.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/98156288539.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/25998930144.pdf
    • http://moretonassets.net/userfiles/titokotiwubesizupifa.pdf
    • https://bakwanudang.com/contents/files/17404243507.pdf
    • https://academiesutherland.com/userfiles/file/mujixubabono.pdf
    • http://www.kotolantopeni.cz/files/povozipituwi.pdf
    • https://xtremefitksa.xbodyksa.com/ckfinder/userfiles/files/59780898631.pdf
    • http://oldstat.ww.tj/img/file/83942190504.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_off0000ab4d.bin
d726762ee4bc04f5b7d2f053fd8552d98185f5a811ce2e6012fcc1f60e1a40b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4D 9796 bytes
font_01_sfnt_off0000c0eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 16792 bytes
font_02_sfnt_off0000d8fd.bin
8667adc8733b9084101fb36cd86907ef7e2847452d78a931ea23687c8c9142d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 15956 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.