Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9c98e270d3c635…

MALICIOUS

PDF

227.8 KB Created: 2021-07-01 13:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 972d94dd70d6a2e1b40a1b273f3f4968 SHA-1: c3ef8b39f2030cf684a973d3ca138fda591b84b6 SHA-256: 2f9c98e270d3c6356f333520305644ab6099970b3f9874b3969cc9c731156878
166 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of PDF_SEO_UTM_REDIRECTOR_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests the document is designed to lure users to malicious sites via SEO tactics, a common phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

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 https://catamma.ru/uplcv?utm_term=javascript+get+max+value+in+array+of+objects PDF link annotation
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a41a9f0c02e6ac6a343b3fadf48ddc28/mivalabilosakavexemabu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0hao54htf1t4ikuhff8crnn8lg/93355304330.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/bimijapar.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/gickel2vruj9ljd2pnjudd24k3/71849625547.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/74385876147.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/wivajilepafekebumukapeki.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/wobedavibidaratitiven.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/07ejndgltnb0q5sdg4df5ft33m/49446892570.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2255e60d8---61766272841.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/49da27ba784164a4265807840d49f7a3/93628240728.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc57671bc---fivigexadetexaniwi.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/4e28r71r88n6rb8r73fj5odkio/jeparolowonixo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d297a19f8---nudodorezefidofa.pdfIn PDF document text
    • https://designclarf.it/file/52824082881.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a5f97218f---lufobubeka.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/15319963334.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/wagume.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1f36ba2af4043e6c957806feb747c7dc/repomerifi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4ac2469fc---10146738994.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/84827457865.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1aca2378a020aedc4cafe9b3e89b8bc3/zusol.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/8829927037.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/jejixisopujulo.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/e8fgu9s8pvi7vlpbmtkpquvnam/gepizanafuz.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3012D 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_01_sfnt_off00031726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00032f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32F38 20844 bytes
SHA-256: d936f8d082682300cd54d7fd98d517b97b472576438bc30a3af374f702f0e265
font_03_sfnt_off0003656f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3656F 11464 bytes
SHA-256: 3aa42fd1f70b337614db67ccd4fa73741da7a61d657ff5fc01f56199f42cf4fb