Malicious PDF — malware analysis report

Static analysis result for SHA-256 5673300e1df70433…

MALICIOUS

PDF

97.3 KB Created: 2021-09-20 06:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a53348f8beb60d35dea2f6b78618117 SHA-1: 22890e74fb267c5c7f909bd8cc4fe3f743aabed9 SHA-256: 5673300e1df70433d4708645f8e9403cdebbcfa4d2f112fe57e12f258c755bb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of compromised CMS upload links suggests an attempt to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ablerexthailand.com/userfiles/files/77191239665.pdf In PDF document text
    • http://banquat.com/userfiles/files/dikuxanawilumerimumivifuj.pdfIn PDF document text
    • http://01host.ru/userfiles/files/4410511775.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210901162126.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/51978248604.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/9d9f2eaa8568c2175e88c52c7ce13b8b/fabojigijesadujawowobop.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/68573063406.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/josojevufomivefexol.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d659a1f930---52555223380.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/3810987233.pdfIn PDF document text
    • http://metallpress.info/files/38122662831.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/vejufesetozenek.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/minavutesoxujusu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/lupuxejugupozu.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/vanexesugase.pdfIn PDF document text
    • http://hengtongblower.com/d/files/mumoruxejetejabux.pdfIn PDF document text
    • https://majubesar.net/contents/files/palabamubemexigowevipo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333a0f4519d---54362342812.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423525254ce---9339029851.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/63453005837.pdfIn PDF document text
    • https://sapporopools.com/contents/files/92448705837.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/27580900999.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/37315520417.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/girutezemodesivajax.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161371153acb30---12331734355.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/2463792411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=on7+flash+filePDF 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_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13494 10068 bytes
SHA-256: 5d7ad7a74aa70f572407cfeadc83f7f00968957295e5004928501aca7a4162fc
font_02_sfnt_off00014af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF6 17088 bytes
SHA-256: 2e74a1cc285ab47e90afa88abb5c09d8afea88cc059c15e7e16971b776a26bb9