Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6f2aa6065efaa5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 15:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba4e9878f02b18e6cf6c23ca79e9d97e SHA-1: 4ceaf57ec1d67a91c7d8eab2a1449b076960fa5f SHA-256: 8a6f2aa6065efaa5e601fd1f6bee008c3bd19a7ce65ee6511f8a14d9ed5e5cab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm. The link farm points to multiple distinct hosts, some of which are hosted on compromised CMS uploads, suggesting an attempt to lure users to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=it+takes+a+man+and+woman+full+movie+online+free PDF link annotation
    • http://inistor.com/ufiles/files/96876354744.pdfIn PDF document text
    • http://japhina.com/upload/file/peferegukuwupoz.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f4947e01b4e79933bdea029ddde6d519/38361245185.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/nejozavezibofaki.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/69293075203.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/rapepozewub.pdfIn PDF document text
    • http://canvangdientu.com/images/file/35649472767.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd9f8ca5c---55097099876.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/47651224008.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/99630242543.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/85403075895.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/47042195843.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/81aa334da86fd53b39720e249612a472/jegolopiduwugidiwenawi.pdfIn PDF document text
    • http://enewind.com/pliki/file/dugumubutejeko.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/netokesesinuresis.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/40616836229.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/raxisazilosirotaja.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d7a45d19148dc87b452795d3f7ff8f10/26551218877.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/23816876291.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/995732805.pdfIn PDF document text
    • https://o-dance.com/upload/files/menezajoven.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/51255669625.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/zepotetijo.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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 10808 bytes
SHA-256: d22e9f9f2f59698ace2d5a0c36d67558b1502b1099af49e90040505154d736fa
font_01_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 18296 bytes
SHA-256: fdd0006ed28b9827de7cd4d0716f2c4228cac201e421ab8b88300f942db76527
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1