Malicious PDF — malware analysis report

Static analysis result for SHA-256 680e2a1f8c8899c1…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 07:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af0bbc3af2122217aae505aad684feed SHA-1: 37f50ad5eec65af3f308d5b9516c18cbc35789b3 SHA-256: 680e2a1f8c8899c1330e6c1072c54089c0ad4c848222cb770c7fc26ce1fd2c5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to potentially compromised or disposable hosting. These links are structured as a link farm, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://garglob.ru/uplcv?utm_term=virgo+man+secrets+pdf+free PDF link annotation
    • http://ohsongpharm.com/ckfinder/userfiles/files/23501835830.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fusugug.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/90348125001.pdfIn PDF document text
    • http://katachizu.com/img/news/files/66271051652.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/zujijojenirukule.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/95196307027.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/86095992522.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607489c595c55---tokaniwezijev.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/84544693143.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dirolus.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ddc9c1c7a05cce89de6dad9a98e1edc3/xobelapulutexi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3d06d2e247db0e562fc6b0bb89241d20/lamixusamevomagoworojife.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/bixiririxozegabazubiwilo.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/42896467077.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jon3ohk8cujncvc6blqnqhmit1/fazapanoruzewo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/acda2e9e428ce69f6d89fe629bb6e6b6/57466993824.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/2921173172.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/sevonorusupok.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/90774705064.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2dv16ffgmcb2jkeos5010hcpcm/71026239924.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/74285136096.pdfIn PDF document text
    • http://bociany.sk/media/file/26703787702.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/86abdee0581242e3e32e07f1d2ea5656/77711532288.pdfIn PDF document text
    • http://anupbolivia.com/images/files/fukup.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/vezenukoregidujagonezokik.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/pisabajililixajetexelinar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16304 bytes
SHA-256: 0993b34ce16b828baf87bb2e682519ff3144619c5914bcfe902687597ce70cd4
font_02_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 10884 bytes
SHA-256: 853bedb329b37e04555d9ad74d3940273de0e72fd9729832d9dd2fe8bc682a45