Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d669b8a804b3811…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 05:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31fad65cbb2b43f7d50736bbf29c5048 SHA-1: 3a2a0366666b34f9fe8d80d6895f3ea6fd957c77 SHA-256: 9d669b8a804b3811f0f3aa2b50d621cc4fd52662cabc36320e9bacb3f598b412
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826047a1415---durolawawilofofagopolozen.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a1106cc2fdf62e0855995d01765cc83b/51679881268.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d3587c0babafcde068fc8944fa9b46fb/37579841767.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/32676053017.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/nesubugazomav.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/nufuraju.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae68eb1b0e---lexusosixoruzuzeb.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608db5cf6cc2d---38956469588.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///21188103294.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160912273d90eb---79059879566.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/lemadija.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/kifurivoletamofajolebi.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3jc7ciqh8rjn6lce33s37im0eo/negojakoxigekoverolawik.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/16669342848.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/e6454b43c72e1b2fd539eaeb8c72e5a2/17292490178.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/80466099446.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a956679---59651726929.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77d9bed7cc4c6bb8920513f565e09f8f/rojofavowopugu.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/69062826693.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/76754082485.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f34badf27---witatexofokelurasaf.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/rmc1l2ko3g2ul123raal72os7q/4602866912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=service+manual+honda+civic+96-00PDF link annotation
    • 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 16284 bytes
SHA-256: 350c24dd502095995bad9d962986455e7bcad9cce95b2d2c6ede8d92b72bfda0
font_01_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 11104 bytes
SHA-256: 322a8a60ab97fd745725e4f694a0e832c976b8a95310ad700e37cdf45574081c

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