Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c5f998784963ae…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 22:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9eaf5df0af6e6f5c4fb3fbfba1106082 SHA-1: 78ed58024a1602fd6771a3a78ff0b5a54ccb5233 SHA-256: 25c5f998784963ae79a1d63d1f06e2b33cdd84e0ce6e07711290ad4d52414a8e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The presence of multiple external URIs and links to compromised CMS uploads suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=bft+eos+garage+door+opener+manual PDF link annotation
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kugadomima.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb7f96b69---tanibonosadikeriwe.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/732cb5e2de8eb7da85e79b3174d1032b/14878610995.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/xojikatul.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d285680aae6---suzavik.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/47032396899.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/52324115436.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/zawuweke.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/25655183020.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10881689a6---8427997567.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f541d464---57382820966.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/fasifatosololut.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/60394015538.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/monivilalewukoxijezufipuk.pdfIn PDF document text
    • http://royalgroup.at/tmp/bexaruxezege.pdfIn PDF document text
    • https://masukpt1.com/contents/files/49602300471.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b9ea793560272cf26655c6f5fec87ffe/sixabuwilapogiserejijegu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161062ab012217---bevelafutazudukefazekima.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc3617893---95932737135.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04eb14a67---tusijawasomokatu.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/gufuzokufinagadasozujuz.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/85428045375.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/malinufudo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44C 16568 bytes
SHA-256: f507f11bdd0e08096ea8ef166123d6c44b8d0239143edf635fffc18b000ffe35
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 10900 bytes
SHA-256: 6e7139fa38e72c1bbc7d08eba390ee35fe0914d36ba69cfe4d1c9e914a082020
font_02_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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