Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3444636082ee90…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 16:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f87748dd3700b30f0c3f690731fb35b4 SHA-1: edcf26067cc83644f9e62fd31c093a442322d4a2 SHA-256: 4e3444636082ee90474c3156d8ec8b2f099ff77b121d534b465051b758bd6159
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised WordPress sites. The presence of these links suggests an attempt to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ed895de4---31040154709.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/07a314b56bb989e40d29b3d44fbcdcea/subumeze.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0g3gal9ntl2frqo0gn2i07fdi1/juwovefa.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b955d3c7735---zixuna.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50e01a003---79514561309.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2618ca47d128b5def0d9a3ca6163349c/49071025733.pdf
    • http://ghalemdi.com/userfiles/file/nubozo.pdf
    • http://akcjonariusz.com/UserFiles/file/99451234570.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/74f877da07bcfff941292f5434754743/26748173528.pdf
    • https://caribemed.com/userfiles/file/88969163059.pdf
    • http://uctodane.cz/UserFiles/File/43825772675.pdf
    • http://uppercanadatwocylinderclub.com/clients/877835/File/29005948046.pdf
    • http://childconnect.com/swi/fckfiles//file/71791055049.pdf
    • http://falerisztika.hu/tmp/vajolo.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46fd590abb---nogolimilaruvapuwine.pdf
    • http://apexnepaltravel.com/userfiles/file/81430561563.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ed297a2cd878652738412747ab854751/72968969895.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8fb1c180e542ff1770e056b573ed9c44/63886761550.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ma5p0aqvllvtdv71kvld9m9t51/zatuvafopafog.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3d546498---xowokirisi.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c39a9885---pofam.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f365e54d3c---bibevezifaxa.pdf
    • https://tanthuantelecom.com/upload/fck/file/89725105626.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+stables+collierville+tn
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e329.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16792 bytes
font_01_sfnt_off0000fb3b.bin
547c14ab0db3793e96df513fbf6956bb7b9e39d270f19320509aa43edab63828
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 17888 bytes
font_02_sfnt_off000129fa.bin
67680a58425402a8c5dad8617da77deba2e3180cccf8ab3ed0d0ddc68bd7efba
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 10496 bytes