Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f807f893d023ba…

MALICIOUS

PDF

93.9 KB Created: 2021-07-01 14:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c26c13250a6f336acbe306a226255f6e SHA-1: 5858c69b48d0b4e054a5e5af4e3cbe8d9741209f SHA-256: 79f807f893d023ba977264cf6ab83d6cb1e31fcf56a55425726e63cec973625a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by a link farm pointing to compromised WordPress upload storage. While no executable scripts were directly extracted, the presence of numerous links to potentially malicious PDF files suggests an attempt to trick users into downloading further malware or visiting phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c664cd3a517---93152350094.pdf In PDF document text
    • https://nikosdimos.gr/userfiles/file/78398039881.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/japize.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bde24ea656e---82154783344.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd35fde6ae---59439491475.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d2e51d421cdc2f3068f194bd3c20b333/zifatugetin.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/zajowokijozowex.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2fgebfam95vfshv7l4c7of52h7/ruposotozefakures.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/34954729289.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/j7f98c3g6u798k6rbp99q5motp/18173622252.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/43089115471.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/09afc8d97236321cdaa2faf9d8c62442/79359495980.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d79d27f7f---jideremonapisodexapurobup.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/wumusizeputikor.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/be1baa744ed0cb82023e3322da93d840/57729074051.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda02a4bf8---joxujeribi.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210618_B674655FC4EC723B.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/60807159524.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0fd12c64---78042780441.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5336c1b702---91853591425.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/599101a5b7b73502733cf196f6fdf2ca/73969911041.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbe18d0cd0---javagokikixutaj.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3dn4bhf2dj4601e3nucuggsamf/zapuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=another+cinderella+story+123moviesPDF 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_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 11140 bytes
SHA-256: ad0a0ed5ee434d19cc25cc6a07a83e82a609977f65b0a8fcd6e831d08817670b
font_02_sfnt_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 17964 bytes
SHA-256: 43da74af2b0bc72d52a445e9a6040bded465594beaba02e499c6800b485717d7

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