Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99b3457357e7356…

MALICIOUS

PDF

68.9 KB Created: 2021-05-28 04:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ffac356c85412c4bdf4a81b39261a65f SHA-1: 230fdd3503d87e12b4d1778e719b2f307461eac8 SHA-256: e99b3457357e73560857e580254fb9740fb4bcca3650e1a67ade4955e04bd6de
156 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/b53ae4cae934d834c9904fb03bcec2f3/78106175713.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bkfdqt2f4493onpagqmsenpd66/nenifixupuramaxudixasuti.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/3aipic43j7cmtousp0ebo3j9u4/sixofizuraxal.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af860bcc2b5---rawodinivaxedidomisun.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/fekuvukexezagewo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ca06d13b---nudejovisalu.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16206137093555.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mubibajisutugonub.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/fofisotigima.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0098e4d0cb---32464565253.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/11675597841.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081318136d80---bebukilejusizi.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/3bd61108a4be85b1e5ef419981996b4e/87710454226.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/10408573532.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jogapabetesisipuzupivap.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/58548421098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=kanawha+county+school+schedule+2020PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 5368 bytes
SHA-256: b9bc1fa88c6a946130aa8840ea03a3f5d77cf3380a62fd0b8b691bf97eb53e04
font_01_sfnt_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 10644 bytes
SHA-256: 4cbf01b13672a02e3916096a2508f5c7b26c28324c3101b0b9c0e987c77b1929