Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c0092218dcebab…

MALICIOUS

PDF

184.2 KB Created: 2021-07-05 14:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 779efb892b064f6dc07f07712faf2fb8 SHA-1: c276effb182bb9c2d2b58e91fe0e594c1ee86286 SHA-256: 58c0092218dcebab599d9a9b1db693e8b96b89f1f068f4ab59408d87cb0ac842
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities or social engineering via the linked sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a33ca4af8---felebafarimaxopudu.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee61e3d1d6---jumomavapipetixufajabinaj.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d84b57ece---kegodilupegokibife.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/smvj63u5sebpigko8jgi11nvud/jabalujofegu.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/66bgpnus59ifcqppi118ec7c6g/nozewez.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/90j45rd1ooskalitl6q953o9o1/tunuxulujolitakilafolos.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab8d8b71a---88537062623.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/53253891485.pdfIn PDF document text
    • http://fitviewer.de/files/file/puxulositerujo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddf2e819b---67843417255.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/rikegijosizozivopajagasom.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/zudigib.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/11391841262.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/209babe0a5445a32096c84c88ef2c991/befulakuzol.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/wezuborekokiranip.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/90224445650.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2qgvh63dqsjdk5m6fbf1g2qp49/todoxajesavojeganokavad.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607be67b31b0c---xexisowusisozot.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/jigotifupudawameg.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tvhfkjvchnrf562s54ofor0ond/35189318486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hock+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23150 6692 bytes
SHA-256: 4a1e1cc018e2c68544607b5c11e5cd0873f83f78a5ee31716d0537b4c1ed0b01
font_01_sfnt_off000247c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247C6 16492 bytes
SHA-256: 7a8851705d5335082df37136e21cd35fd79ebe008978f2e3cd477753d394a85d
font_02_sfnt_off00025ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25EA3 10388 bytes
SHA-256: 9727794ea9ea45dafc09a91881be3aa555c7cd6f643a31a936b100a561f74c68
font_03_sfnt_off00027612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00028e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E24 28068 bytes
SHA-256: 882090d02e4812d841cd789360e47001e88bcbc5dcb394bce106168c90ac0925

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