Malicious PDF — malware analysis report

Static analysis result for SHA-256 67eea7c660cca282…

MALICIOUS

PDF

80.5 KB Created: 2021-10-12 07:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aff8b716fd7482912e4136d6c6692f41 SHA-1: 3a31cc5767362b183ecde885735e2c3a294332ed SHA-256: 67eea7c660cca2824fd0fc7b73270174e617e2b3cb06ff62078e256794083b24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or lead to phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6c28cfce7ef66491fc0e334acbece3e5/kakudosagupiraviw.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/mevizir.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6cf72abcea567c4dd787b0c7161dc617/42242069681.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/83327859020.pdfIn PDF document text
    • https://soechi.com/userfiles/file/8080121692.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/20037438328.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/80749834872.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/87660060934.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20211006122428.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/dogategidok.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16161d51a9ea5b---48051862690.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3270dc4539ef5b6c0d1c4afee4d91959/55006574379.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/zaxosubusavi.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/27030716786.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/jirovix.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/62554407620.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/gisera.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/silowusekipazire.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/14612103476.pdfIn PDF document text
    • https://pcetravel.com/files/file/vejavapabojowamazabav.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/57780676109.pdfIn PDF document text
    • http://chinahanaro.com/userfiles/file///24277702724.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=proportion+problems+with+answersPDF 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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 10744 bytes
SHA-256: a154b85742cf86bbbc0925f59c5ae685253c1e41d364b3c49346862ac8223a9a
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 18100 bytes
SHA-256: a6c9251303240f81dd7584e0e312a00941f5d3671f85ab5bf20f596e854cb4d7
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1