Malicious PDF — malware analysis report

Static analysis result for SHA-256 21edaa0e965d6e85…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 04:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2c166b8d5a75488041df67bdc587258 SHA-1: d56234c62bf36ff9cfa6f0dcf04cf80404c7895b SHA-256: 21edaa0e965d6e85ccb0cd1c76fd73d0245a2e3c5e0af7c1f792a3684bad2b8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=auto+app+installer+android PDF link annotation
    • https://giridhareye.org/ckfinder/userfiles/files/34331843573.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/rovexegur.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/54100113274.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/56212585770.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bgkuumjnscpdi40p5tn54qg6p8/vafozemerokup.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/nezefu.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/zumefukirugoko.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/doxud.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/jojazivapogi.pdfIn PDF document text
    • http://chayka-svg.ru/files/31716612323.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613878a5e6666---70490834763.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/ramuralimipodelefiw.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/36575147707.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1020a6809---91637180529.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/53980034191.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kenakutadaroroxadirer.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/begobomegadodedowo.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/buwagoru.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/56881632039.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/nomelodepofuzu.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/21388290701.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/zalanitevuxivolemoneke.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/28410270837.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613815254685d---sanelunukimunemute.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3nr7sb7v4icec7se8fgjldu0f3/losevufilegiravu.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_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 10464 bytes
SHA-256: 4e464837eae07cc417d7403f96c92ec5dc1c427bf645371e51cab2cc662d68b3
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 17436 bytes
SHA-256: ed236841bba392065767cdd93a51a8251d25d0dadab56c287fa0bd7fee4cec82

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