Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc43ac137cdb5a30…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 23:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70ec62ab06377d5d06db53eb0ef46bee SHA-1: aaa634e42d4d51f2c78fc9720b1dc3e56cafb3c4 SHA-256: bc43ac137cdb5a300edd18f3eeb9ad949e92c739f90cdc0b295d96967525a947
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The file also functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of embedded JavaScript and the link farm structure strongly indicate a malicious intent, likely related to phishing or malware delivery.

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.
  • 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 http://velapower.com/glwh/UploadFile/file/2021090915154573499.pdf
    • https://topclassgardening.nl/images/file/zogogaxegoxavino.pdf
    • http://td-mg.ru/uploads/files/62344549068.pdf
    • http://location-appartement-venise.com/italie_documents/files/lufizuzufi.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/misesifanogexojeruduki.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee15737b39---wiragejiralos.pdf
    • http://vikohasanfiber.com/upload/files/12594428933.pdf
    • http://chiangmai-esc.net/user_img/files/dijixatu.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b664f345---pikosaziwujupezokosalo.pdf
    • http://phuclocvienjsc.com/uploads/image/files/nawetokome.pdf
    • http://hoanhaochemical.com/uploads/files/460938457.pdf
    • https://godahoian.com/app/webroot/upload/files/wisupirojivosewa.pdf
    • http://cuacuonanbinh.com/userfiles/file/97446692110.pdf
    • http://kozelskadm.ru/files/uploads/files/goxinedavakimuduvaxi.pdf
    • http://lagrupacio.cat/file/wexanur.pdf
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/49738008221.pdf
    • https://merohamro.com/ckfinder/userfiles/files/denemisefilazonunizinati.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/1478540624.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/luxifix.pdf
    • http://tiwtactic.com/userfiles/files/kerogewaxinemigava.pdf
    • https://trungtammatnamviet.vn/upload/files/6335386712.pdf
    • https://xn--fiqa735be48e.com/upload/files/mefifubuvoxidakajasabaz.pdf
    • http://rudolphalexander.com/uploads/files/lirulopojogofokudalojoz.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9264fe07f5a251f605629a1617ab7e18/zatowoxuromazarofanoxawe.pdf
    • http://geologicatoscana.eu/userfiles/files/27162077889.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=atomic+radius+arsenic
    • 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_off0000c883.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 16792 bytes
font_01_sfnt_off0000e09a.bin
bd2fa8a3d8eecc2703ea337848d8b0e31321edb1d334a0bdd830676a3e13e168
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 10564 bytes
font_02_sfnt_off0000f8b3.bin
413c46f6b641517749fc7bb44476a0cc55d608ef0c0466909169d02e1f2029e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 16636 bytes