Malicious PDF — malware analysis report

Static analysis result for SHA-256 02475decb0dd01db…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 19:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee3ac327814dffe05e46ec63dafc0fa3 SHA-1: 013463bb224bdb2b222f2f2b04e658620bad8767 SHA-256: 02475decb0dd01dbd8f55ebf67dec826f26b53e209294bda34000af14497859c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users through these links, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b488b235---91634144005.pdf
    • http://bagiez.de/userfiles/file/4060997489.pdf
    • https://hanyauntuktesting.com/contents//files/kiruzujejafodemewawukide.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609057c5cb6c5---kugema.pdf
    • http://www.zywawiara.pl/pliki/89261251549.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/94407948410.pdf
    • http://poslovniimenik.net/firme_data/files/66868530871.pdf
    • http://gpszone.hu/upload/userfiles/file/nazorowujupiwesexejusebe.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/as70p03jehb8i6o98laam6m5e3/wezitifik.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c410dd02f87---gojefumuxesoz.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc5e0e7eaf---38124712657.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210813_002109.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/tuloke.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db9b2b1135c---lefefavijiz.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160736a3f8d48b---34297256700.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48a6baec5---81218796907.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607186fd8df10---torojunomixijewego.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b774b95339f---jazebomimuroxages.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6140f18e344f2e2da8193a6a9c1f2705/44177551015.pdf
    • http://hermandadperdon.es/userfiles/file/19575871024.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0ad6af48---piretorunoximagadanemojo.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1549a56202d31503f83530ec22323ce8/20282945786.pdf
    • http://residenceraffaellotorino.com/userfiles/files/mosemelugi.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/32399345213.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=procedure+text+printable+worksheet
    • 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_off0000b86b.bin
ccaa4d722eefa28787afd483cbafd42372cddc60688b19946aa74fcb45d70f61
pdf-font-stream PDF embedded font (sfnt) at offset 0xB86B 14616 bytes
font_01_sfnt_off0000dd08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
font_02_sfnt_off0000f51f.bin
fce1c2f11b6a94b0d3f0c35293b2c0ab03801dc1d54b027dd9dbf57a4c5cce12
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 11132 bytes