Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8c9827ea38d085…

MALICIOUS

PDF

75.4 KB Created: 2021-07-02 23:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b258988f60e1ab7fa75d6ce9f416e22b SHA-1: 9b9aa55ac38cd3f0f8923444535b4ce579bb9828 SHA-256: 9f8c9827ea38d085d2e80b2c2d352779e7b9db21955a71be74947b74d8ad4759
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ahreco.com/uploads/news_file/tebanizanopave.pdf
    • https://bloomeng.com/uploads/patupif.pdf
    • http://orhs76reunion.com/clients/30721/File/basazejubuxuxerabolipi.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb357e8038---49695603905.pdf
    • http://zuche0551.com/upload/file/11943467728.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/l4s50jfr42i2tkebo52fjc5n06/39196793952.pdf
    • http://meble-tk.pl/userfiles/file/39934337446.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/20763042379.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c2e91157---pabijezowidesap.pdf
    • https://smartcirclegroup.com/userfiles/file/xobuzuvozedirer.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074adc333fe5---9791166748.pdf
    • https://tidaksusah.com/contents//files/sifexoji.pdf
    • https://discovercefalu.it/_data/images/file/11178632110.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4086uk509kc2toetpogmpa83r4/95015659123.pdf
    • http://usdcp.jp/user_data/userfiles/files/20788495221.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e99a1695d---rirenojogokaxokigege.pdf
    • http://gdgom.com/upload/file/2106252359051656235h65e9grd5ez.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15a270bbb---22388806389.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8b6b74f52---zaruzifiz.pdf
    • http://studioindelicato.com/userfiles/files/79268943394.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d6c995d6b---vomol.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4f86b07de---zuzatufoxekezope.pdf
    • https://zivotzaokny.eu/res/file/roxinasukizorofalosileled.pdf
    • http://mlight.cz/archiv/file/muporepegusa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+song+rising
    • 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_off0000c610.bin
f4a9c5a8d060c62bcf84c7c1987d08b865099fb56a09a5bdfdd7f94f38d0f524
pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 16364 bytes
font_01_sfnt_off0000f0c4.bin
9d621c910bdc86cd9e86272c50f7da0ede941515a604a30af3fff70e1d52454b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10044 bytes
font_02_sfnt_off00010703.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 16792 bytes