Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ac50badb46f231…

MALICIOUS

PDF

89.4 KB Created: 2021-08-10 00:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c687fbdc2d9a96167265c08391e3ff7 SHA-1: 18a03bf9147b7e15e2d078a7e782aba2dca2106b SHA-256: a7ac50badb46f231cdbc802cc1fd335289a555a29428cc7cc8878025112ba2f9
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially malicious content suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/968b0e51a6fb455fddc88d28aebeba69/pozigeziwadexatelape.pdf In PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///79490046680.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0aocnhqqmf26c484ri75s98chm/saraweguga.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f91345d07c0---xomegobo.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/f3a2f8a2e259930c77ce7390f523e78f/87165898648.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/bagosesujureve.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609874ae722b4---34544868051.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/rirokimubifedesu.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/suresabapamufewamod.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/7f5b0592e1d22863cd737fccfaca4ad1/bixagikumiw.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/t439u157usuvs3tck92dal5ua2/fugubegonasuvawidanuxoz.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tegh6nania8i2ks8tkmut9t2st/mujovegegitu.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/56702795120.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dd0b20e6---pubuzopitomuj.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6e1cbee9---wubukiferu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f68934f09f7---16879657918.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2a528ed59---46757236776.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/xefifiroxuzamaporesuwafez.pdfIn PDF document text
    • http://xenangheli.vn/public/files/gosuwisakodaxodazibe.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eca3e16ed---vubefivejozifi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce47c649a---40711994625.pdfIn PDF document text
    • http://yuli-china.ru/d/files/pipizezukokenogapakojaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=writing+compound+sentences+pdfPDF 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

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_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 17032 bytes
SHA-256: 6f0bb2d085b867c2f3af6df95d94def3d2cc803630fedc9ca30158b7cffaab04
font_01_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 10848 bytes
SHA-256: 26cfa3a9a4c19530846be39cd7e1a4369f758c8404019abd46f79162f90adad8
font_02_sfnt_off00013f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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