Malicious PDF — malware analysis report

Static analysis result for SHA-256 428d45c143fefb2f…

MALICIOUS

PDF

82.5 KB Created: 2021-07-08 01:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43d629e1afc507c84a7c9e6c8788cb38 SHA-1: bc9f6c39d9cddac9d009939e6c08dc06100acc15 SHA-256: 428d45c143fefb2ffee4a3926659ad478eed5982e6beec7eaaa65941c3c79da5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/19fe58bad47a28897ca01fb270e05910/ledinejajiribezejepirim.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4a42fd3b5c0302e2f7f2138033110eb/vosoguv.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/visumokuvalapatoto.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c775e87a42---13927847728.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1822ddd3e9---73649013938.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/14557809335.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c4289f7f7a62ff11ba951cae81a69d30/wanisaz.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/6a309c0fbcd02f3aa868294d34cca17a/lapakofapuxirofonigij.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954b165a239---zaguzetomax.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9t1qa7nb7i20bnidq4kpf8tt3h/vapitozorogowopufuwasudu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec59aebb9---69170026004.pdfIn PDF document text
    • http://cwesp.biz/upload/file/65655582256.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ef00557e44111d86df4a3c6292481043/94222125526.pdfIn PDF document text
    • https://badoza.net/userfiles/file/51141649398.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/60697943881.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/g5tcof667jo6mq3aaki489u2d4/79761287188.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04964a42e6.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kulagowovowe.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/84331461307.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/xexapinedibukel.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/venido.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/84638394893.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5671d4a7a9---7965898933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=conservative+and+nonconservative+forces+examplesPDF 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_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 10980 bytes
SHA-256: 372e1fb90d4117c9243f36d71008607578b19f6afef5b0e4429a6e0ff28c0b6c
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 16764 bytes
SHA-256: be3e6ca7614248fb2304ad7069c83391f8605057b0733496bb0277f701c96a83

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