Malicious PDF — malware analysis report

Static analysis result for SHA-256 4455e3797c4f9ff6…

MALICIOUS

PDF

208.3 KB Created: 2021-12-01 04:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: c7a53b1771791ef203f7efd1195a9313 SHA-1: e15a66a979be88fcc88f7dc4c7bcda55fdea9fcf SHA-256: 4455e3797c4f9ff6838b3401701f963cb7791911f614135975c5953e133b6e7d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's part of a phishing campaign, specifically using a link farm and SEO redirector to disguise the download of a malicious PDF. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a malicious payload, likely through a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8469

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://internet-trade.cz/UserFiles/file/tumizefawuva.pdf In PDF document text
    • http://engineersclasses4competition.com/files/others/38043946484.pdfIn PDF document text
    • http://ecocj.com/userfiles/file/20211113092809.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/46860480327.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5b1e164a---56822540760.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/raxilapale.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a43a7bc32d---gekosaditojoberakevubofof.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/84237621123.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/rololobanaxaluv.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/18985454311.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/37039646079.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2cf92357ed61328b0707ff19316ea58c/59877494139.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/wusegege.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/magapiforisekofibakini.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/migumekuwaxopijipa.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/24431917027.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e5b0db7259708579ec05cae803d281c/98863202965.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202111241714218686.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/sesomejifetidin.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/44631474096.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/33161059515.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=unabomber+manifesto+pdf+espa%C3%B1olPDF 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_off0002cccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCCB 19940 bytes
SHA-256: 6b5215e484428658b5b5ae6c4d2081129fba747e1e5c67cd9a7bcf913a313d10
font_01_sfnt_off00030075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30075 11012 bytes
SHA-256: 69b326e41acd64e90b81a5523005d63f328aaa4432131666474cccb4c3fa3960
font_02_sfnt_off00031991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31991 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336