Malicious PDF — malware analysis report

Static analysis result for SHA-256 801e1feec141621b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 01:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a43918acb6710a8355b4e4e1b6108c8 SHA-1: 23e604f2bc80a4e57325434b2e13be3adc20394b SHA-256: 801e1feec141621ba7dc308d09b31fb07c088069c055bdf90a2e73b2d9c12bb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=cracked+mini+militia
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/revewutawitodewu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc53c7a61b---vuxufunizinesakugimodimo.pdf
    • https://togeltop.net/contents/files/luxefulo.pdf
    • https://honghow.com/ckfinder/userfiles/files/nozikewojekumafabubotiz.pdf
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/51085181622.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-07-18-46-17-36.pdf
    • https://zooiguana.pl/app/webroot/media/files/winigi.pdf
    • https://micsys.in/userfiles/file/47997439757.pdf
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/zelavadaw.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138129a89151---48009850115.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131670c26a99---ratutavakiwil.pdf
    • https://motiwalainstitutes.org/userfiles/file/38581712779.pdf
    • http://wiskind.com/filespath/files/20210905005639.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6439210534.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/pajoba.pdf
    • https://hzautomatisering.nl/userfiles/file/bajifovoginetaxana.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0de60254---27456560707.pdf
    • http://kunbot.com/upload/files/72429754418.pdf
    • http://acril.ru/ufiles/files/jedajexesulebafelilixike.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161302ce0cce01---77966421640.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d80eace2---12416984126.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc923a283---65722181001.pdf
    • https://z87992961.com/upload/files/20210919051841.pdf
    • https://kapokcmassage.com/uploads/files/202109162302017908.pdf
    • https://locktactyuma.com/userfiles/file/numixatimam.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_off0000b98e.bin
f9f28ca38baae042276b96d12744bdc06b48c4c8311152df626a2e4ae9401998
pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 16204 bytes
font_01_sfnt_off0000e298.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 16792 bytes
font_02_sfnt_off0000faaf.bin
c7ac00dccdd3e120f19055fd679ee9c92dd51bf113334b2ca745bdec807dba5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10368 bytes