Malicious PDF — malware analysis report

Static analysis result for SHA-256 66455f2e4a0fac5a…

MALICIOUS

PDF

119.6 KB Created: 2021-07-01 00:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90d8ee6774efea0ee62bcd290fd138bd SHA-1: 561449d33824b5ab95d4949b3cf527722885620c SHA-256: 66455f2e4a0fac5a95a4f6e02b1a271dd5dfe33ed47ab3abeb8fb15cbd402c1d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a likely intent to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • 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 https://crewmak.ru/uplcv?utm_term=pth+and+osteoclasts
    • https://rcot.org/userfiles/file/36159816204.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa824acc633---95501946775.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4e61c05f142c6d694b21fb5b03051cf8/18063740653.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f685e6714b---lupuwowavojabuxox.pdf
    • http://www.toptehnik.si/images/3826422009.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ac654ed8abbeed036df222f46ff4f6fa/baxibenatutibosofaka.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92dedbbbf---wijitituju.pdf
    • http://ahchala.com/img/file/dolozavizitowik.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/jusizaletisoso.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f8d39296---mukumafedibap.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/796136421.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafeef9f7e7---dususerasozok.pdf
    • http://ranahytta.com/ckfinder/userfiles/files/45732986407.pdf
    • https://quaint-house.com/zilaxojexojipaj.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b75c243db---lazegabawixat.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be87d2c19---68635501784.pdf
    • http://www.anclupnapoli.it/userfiles/file/xapasorefepafa.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/68e7de330de9d47ac89a11c0c0e405b0/75861492316.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/af7d198794de66811811967babeec334/vofetuwajupuvuworuvixu.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/7751490888.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/jmq2ooeieg0ck77nbd8q6b9h1i/52114760600.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/322e61ab49ae8316dff226c8fb8e8ea0/webigodijobopuxifataxi.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/4317304572.pdf
    • 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_off000170ea.bin
8d0d883e0384e915ef31c6fb9c83b84ad377a0b1b00d636451caba68f345a2da
pdf-font-stream PDF embedded font (sfnt) at offset 0x170EA 18492 bytes
font_01_sfnt_off0001a24c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A24C 16792 bytes
font_02_sfnt_off0001ba63.bin
a93116f47bf729afbc6c4ecc0b5e905220d58a035fc5702a740bc9a509e2d048
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA63 10276 bytes