Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9268c358106dc67…

MALICIOUS

PDF

97.0 KB Created: 2021-06-29 10:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 333303ed7835f95d48527fdd06b3f15a SHA-1: 473a1d24cb9d6cc8ffdf290bcf36f9a422f45225 SHA-256: b9268c358106dc6724cf172f14713e98a6057cf1c8b76e396260a5416a038326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads, which in turn host other PDF files. These linked PDFs are likely part of a phishing or malware distribution chain, aiming to lure users to malicious content. No scripts were extracted, but the structure suggests a multi-stage redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/e26bu1j1892k67bn2ajec6154k/xivugon.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4e18fc66---jasilefebiwotupebomurojim.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40db00d97---pegadalasuv.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/31972901580.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/34202f20292201d1ffef667d0bdc1300/sujarelowajizasuwel.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a48c61701b3---zunekebu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafbcebd03---gexipizemeka.pdfIn PDF document text
    • http://www.siposferenc.hu/html/98948766026.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d8vmun6573of53ln6q84bp5u27/jifefanemeguzaz.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/bigiro.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/7289701623.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/90394390528be0080d2e4936a2428926/xoxuvewutesemode.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad4963820---jabixawawokalerelugasaf.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d6f9ff8e6c12c9f041d936e16c537323.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/relisik.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6d6da48df---kasopevumuvaruxidumano.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160810859889ef---nipizaselus.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/97818155031.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/gukoson.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/7041882853.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/sidadinazolid.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a97a9ea1740---28836504431.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/v950jqivqh0n3efq7klhpm56i1/77789521448.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/9f91ffe4ecb59b5de10bfecb948427eb/biremuzolel.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/5201222032.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c8e283693---kudijosekudixejudunosabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=xenoverse+2+ultra+pack+3PDF 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_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 3412 bytes
SHA-256: d23b396d2c18a5e103ff680b3fa9417a9494880ea2231fd2899158b813746901
font_01_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 17688 bytes
SHA-256: 6856f755031d9a254c5882f361558f41126dc3caaba785217f433bd0e6810d9a
font_03_sfnt_off00015cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB1 10832 bytes
SHA-256: 2ed005cc748362749d47730937512cf6511e245e9aa4bf09d8e1fdd5c68173f6