Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9cb6400f03121b…

MALICIOUS

PDF

95.2 KB Created: 2021-07-18 07:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfcff96a345dbd19e9a33b323b6c8fbd SHA-1: a71e55e599ba07dc59d3bc78d18adffa0238861a SHA-256: bc9cb6400f03121b95ea6471d055728ae9e5462ca55bbdc88605c84cdf09e71c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the structure of the links suggest an attempt to obscure the final destination and evade detection.

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 http://fosterfreezesantarosa.com/uploads/files/60077398315.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/8e7bc4de2af24a8fec85a08ee8188288/jokujakiveniderog.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f8ea338a---gitel.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c0df8dc8123---87312757430.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ntf39h891pkioeuks8rev045da/gizurepikutorukur.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/319e3ff545316cf1012635afd1798281/sawunuvamurifedixikuje.pdf
    • http://avon-bratislava.sk/files/files/forarewolapu.pdf
    • https://dptech.vn/uploads/files/12045153471.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5b666cf01fa33a2b1af0fbe2d50a83f3/83576373824.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ddf3c1e0---bufabejaresixoxop.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3e81a0787d58cb2b5e3ca0ff4b6fc684/13311288992.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f43cd6c18---vifogavivinezulofolebok.pdf
    • http://bbfederico2.net/userfiles/file/kitufabopizi.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/640982942abb29c9ad7005948848368f/kejaxov.pdf
    • https://vocembalo.ch/userfiles/file/dogijasumefuz.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6606573482.pdf
    • http://altaprecision.com/userfiles/file/sogotutuwarewexaw.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/hjqkr3a6fcaf58ouet0kumuo26/wawisodofiwivaxexolisotis.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ccd1bfca---kaxagutamapamolilekasovel.pdf
    • http://begemot-rus.com/uploadfiles/file/2021052217453273499.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/s3spvoiak93eqqp4uqt38egt03/85382655303.pdf
    • https://ascinfratech.com/clientprojects/trading/file/lutokozobewolumafexip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=terraria+old+man%27s+army
    • 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_off00011414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes
font_01_sfnt_off00012c26.bin
b10e3eacbb5b006519d5be45943e3b29024de3c62ff39fef04a2bde63499d470
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 16868 bytes
font_02_sfnt_off00015811.bin
1025d89b0ccfd0aba152b9d1bb20173ea87cec7d9424fa22eb5e570fb5820c95
pdf-font-stream PDF embedded font (sfnt) at offset 0x15811 10420 bytes