Malicious PDF — malware analysis report

Static analysis result for SHA-256 d189ffc6f3ae09ac…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 09:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a33a9c0d86beb4da9c93f0f9190641df SHA-1: 10a3671372ee34ae2e3e81b55ea94b509b86bfce SHA-256: d189ffc6f3ae09ac6ebd0b013f1a0fa063ea10c49a51f0325a3ac31ceee59bf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a 'Pdf.Phishing.Trojan' strongly suggest an intent to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=slitherlink+puzzles+pdf PDF link annotation
    • https://stijsr.com/userfiles/file/dupesuni.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd70e22f5b---17998431158.pdfIn PDF document text
    • https://diphong.com/uploads/1858450838.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ih7idltjr1hcacd8tutrtjp0j1/21386266557.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aae66c2b78c---bojubexatisipigo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8509495b09---96210553272.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/83931100605.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e7d74de6ccfd3a7c52ab43cdbc14fd0d/20667941038.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7a0e8d29---fedeseretupakir.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/sunijite.pdfIn PDF document text
    • http://insidethedigitaltrend.com/userfiles/file/lojirojozexax.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///zajizin.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/binarel.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd6de9410---papot.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/vejunumexu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/70c1130b27e50afb44bf008c877d424c/zebukofa.pdfIn PDF document text
    • https://nexusmediation.nl/files/55869410983.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/uc7qa0virv55iket15qk1817k2/kidokukixezipox.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/linuzanuvuxi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16120b139189c9---visokapis.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c19a36eb10---molelidarirajolinebot.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00e79f1fe1---nepifaxemoridilumat.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/viseduxawinexidot.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pazanoxogojegos.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c2f971c9742f19a283f7367e72307dbb/kurevamusivaxedij.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_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 10640 bytes
SHA-256: c8f8ebbf576f134f6866a9831194d8a06f91bde5372c53c78e6ab76a5b3872ec
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 17496 bytes
SHA-256: 2f267f55bde76d6266452d998e2b8122e09a7a6ab953443254a2880a95907ba2
font_02_sfnt_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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