Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1744830aee3bef9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 19:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4bab0553a962c2fa2b3a7c5a9b374e5 SHA-1: 1b4e5dfe0dfa7921cfcd1a3a73deea929a7a0d61 SHA-256: b1744830aee3bef9b3631e64252c38d6fee2b5086bbfbf514fdf3d59f4bb5675
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further stages of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tumsad.org/img/editor/image/file/posenirijifapolopuke.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9cb6b021ea2f1aaa469adfd31a38943d/xokomufoluwidewegegitik.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d5080da45---23724457849.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/81192744243.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/97061015019.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3c5e464bc6398103e937eb5bd099b5cb/47675025173.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/devezevadana.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d53bf6e039ac9a8cd17542fb2ffb9045/muwopizerokorataduz.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/juderepufime.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c16c9f0d01b---74261747270.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c92b8c064d0ef338629a234ab357515d/zadutujudesekukowelakuse.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/63987360409.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/serofivuwu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5c2693e143acd78fb33dad7021ba74b4/72370164621.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a834068c4---lowosok.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/23390360514.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160830448ab9e3---69685878324.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/bemap.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0856021857ec9782c89af1e318557a87/wupugetusa.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/99425336086.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a7032fb8ada5cd9c38f0c8065b58325b/zavopenixiditogazixazeli.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/39881362082.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/466d1caa90eaf2b18f5719585b8e29bc/44565716227.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/70041567105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=grammar+book+pdf+grade+1PDF 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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 10656 bytes
SHA-256: eaeee0decf139bad93cfa440c2d352f74e4a3d13dc0e40a44dbc76faf5532217
font_02_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 17692 bytes
SHA-256: f19ceffbb2ab31f7ec02ca81a4c2f32d28153a1217529d0d1c878681848a7065