Malicious PDF — malware analysis report

Static analysis result for SHA-256 1884422c258de6ae…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 00:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0177b4d361317b9c1271bffa3e7275ef SHA-1: 5c2b32fd8bf352de101e9a4f9e93b73296adbe7f SHA-256: 1884422c258de6ae37518c7769767b54c74812b73fbc585559b8cb210fb7bbab
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised or disposable hosting sites, many of which are disguised as PDF files. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://on-video.com/movies/movie_data/file/17868757727.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613917e1cb01d---48790695530.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/kapewiranibuki.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zozijebewuduzokej.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/18407258458.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2524c087---bejeduderozisewowefe.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db21950a69---91914535961.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/pivojaginu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/53583577037.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/maboputotusifusoxin.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98b6e3afc---dogatuwigesarujosevi.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/43311126375.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/hdtl8f8vaimu760fv9r42mmmhf/kumipikavejezovinaz.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/pajaweme.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9spffkfg7q7i6u96eck61lkfef/9290585375.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161315b276350e---46011989676.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/joxugekojevesafe.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/29869648054.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/58918420005.pdfIn PDF document text
    • https://wrd13.com/force/file/53747853828.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/kawesogajamoxemitakefete.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/16011182490.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/1779389394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nba+games+offline+for+androidPDF 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_off0000bde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE8 16936 bytes
SHA-256: 0934d3e16c9f1f24aa9162a1d7b4354cdb663fb69e69b5e71ff7f7c22e676c43
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10716 bytes
SHA-256: 486bc22586ce52128e8768a5087d680f5e3001edb654313984420d55d99f4c62
font_02_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1