Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20de7c4b4644101…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 20:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 141755673e87635717c9bbfae3b1de0a SHA-1: e6f08902d9ebf17f2baec013b9773d17c6654b82 SHA-256: b20de7c4b46441014b4f505e13c2264e1532ba5745ed17973f2d0b0b52f42333
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button heuristic further supports a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=g+sports+apk
    • https://primer-spb.ru/files/files/serulerutanabapa.pdf
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/94467100293.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6a39dce8713c763ceccff111ac12579a/pijakuzikatofewozid.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/74383208989.pdf
    • https://grnca.org/img/files/files/sewoza.pdf
    • https://myclubowners.travelenvogue.com/userfiles/files/zalikigekog.pdf
    • http://dansensvenner.dk/imagesfile///kozoleme.pdf
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/21181468283.pdf
    • https://lawyerupsmart.com/tempimg/file/gupikulunipili.pdf
    • http://www.lnk-creation.fr/upload/file/2594541311.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091014204480554.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3b04a50e097f3176a96e67c5c262310d/lutaruwomerukosa.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/topomorovuvomupolukufi.pdf
    • https://jechrina.gr/FCKeditor/userimages/file/lekududusukenojotavepobo.pdf
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/22486463420.pdf
    • http://first-group.kr/ckupload/files/lafibekajikuwokati.pdf
    • https://digireg.nu/upload/popesex.pdf
    • https://highlander-inn.com/assets/userfiles/files/tamolafunolidokovalesek.pdf
    • http://canadianrockies.info/files/file/gotapon.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137355a22d81---jagoga.pdf
    • https://childprotectionindia.com/lexcyberia/userfiles/files/povigobogoduk.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d3af26aca9769a5adaa98888da34a454/fisarakakute.pdf
    • http://ailizia.com/userfiles/71536504777.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/57803382983.pdf
    • http://ace-pharm.com/upload/files/11412493348.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_off0000cc0b.bin
6a54856a925f3b283fbe418e2c1bbd64bb12c0568477ef44bae90061b48b4b11
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 10004 bytes
font_01_sfnt_off0000e269.bin
1ab969ea6cbbdb3a009b85a9d03a3f38e7dfd69a29e802ded6c5c63237f21622
pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 18008 bytes
font_02_sfnt_off00011034.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 16792 bytes