Malicious PDF — malware analysis report

Static analysis result for SHA-256 852ce0a09b006d00…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 01:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80555118a97c35f5b10f55db124fb07a SHA-1: 23165cc2b073451bd6e209fdd2f8558196fe265e SHA-256: 852ce0a09b006d00a1392e270227c5fa553a02f468c5f4d8bf10cbcb97dba682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. Several of these URLs point to link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The presence of external URI indicators and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=lord+of+the+rings+the+fellowship+of+the+ring+watch+online+free PDF link annotation
    • http://meble-tk.pl/userfiles/file/5622380936.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/95956801625.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/didilupowi.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/ligugusulefodipubewuk.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/daverinifawevorafuvem.pdfIn PDF document text
    • https://forumsevens.com/images/file/79816800712.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/91875160114.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/caec9fda3d7cdc1bd18e4ff488f17ef4/baruxen.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/86865211415.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/80459063473.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/6768183238.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210910175306.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16315479962017.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/83093884550.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/keluzosimire.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021912_45254_793.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i1eqfthua5hi6r8er4ldqsdgpo/wupovaxowisaji.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/4190112999.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/tolapinudimosutuk.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/bofurupesog.pdfIn PDF document text
    • http://kite-surf.sk/files/raketolobukavepuze.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/54934472708.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614042bab02c1---samulalezubitaxumo.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/kenosowaxeked.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/29004329534.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 17504 bytes
SHA-256: 493e9743ce7a1f921934010a6affb2204e4ebad90c94ec880d6e92d7dd9f5dd1
font_01_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 10940 bytes
SHA-256: 439678a97ed35e6990af4082ec651d8e8806ea254791c008de87a3a3af60e369