Malicious PDF — malware analysis report

Static analysis result for SHA-256 f438ea9089401401…

MALICIOUS

PDF

116.5 KB Created: 2021-07-05 06:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6364628d7e74cb8513d77825d93ef475 SHA-1: 11fbfba75cccfda84df426a911cd5e3530982dff SHA-256: f438ea9089401401a8ca91cfb2d5cc7fb0d664c9e079729f12c1a2ade3328143
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://alteanetworks.fr/img/file/girisijes.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089f9149de88---regunolazemusomegizelani.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/623ede271c142b6eaf9e83aaa18d8220/redulodopi.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/44978386906.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f541d464---57382820966.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/80089735774.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e404cf86f---lakiziterigod.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a19c19035f021bad37145bea4ef6fff1/77671407153.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/45708375156.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jonufokizorilogufitovosoz.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160826e822efd7---femevugonodovukipufete.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766adce4a90---dimojogerebajulosaso.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a358002245---79596385168.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/rh57o8f7l5t58op14vd25agvo2/gunisuxudavobudadanopi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1f96b3da---46605950636.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ao9dpq9oooua7svas0avvqeqn/53281113398.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/17fec42748963fc7ddc352281c3f4241/boxinunefenevugiwevapexak.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a5ea3cc76f908729ed50eb69c6e95185/nukutopibedadiwisef.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/coun83pjffgr5kobvb93h7h31l/74365634378.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3d9ebf1664d97b1d460371683069636/60544381065.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/m281bal5botn229700nkfb6u26/mibuzuvipatizoronugi.pdfIn PDF document text
    • https://davaocarrental.com/images/file/xigozadujif.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0dc1699f03b44cb7cee5f8ca85e38298/30328549542.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d44143358---20468961137.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7163839f3---xevazejojaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=parable+of+the+rich+man+and+lazarusPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 11044 bytes
SHA-256: 900cdfb41f4103c1cc4014e41b8e3b394cda4dadef12056c835e4228bcac07e6
font_01_sfnt_off0001608c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608C 18996 bytes
SHA-256: a56cfcffe4b44dc7447eb8be79310726f724a6465063b4bd0bd4cbe537d1ecc4
font_02_sfnt_off0001907d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1907D 17204 bytes
SHA-256: 503cce9021363bfec219049b986ec0c46761b7f04dc5f43b4c22c38be1e074a5
font_03_sfnt_off0001aa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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