Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cc515b805c7924…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 19:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b86bc2d709d803ec00e4e13ff5c38ea SHA-1: b1f2b2c16a3451290c25231cf69d9bc4cbcc0860 SHA-256: a3cc515b805c7924ccf14e6ecdc5a2e34b0150c1f0999b1ff36d51fe0d104aa5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of multiple external links and the overall structure strongly suggest an intent to deliver a malicious payload.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://lagrupacio.cat/file/nivuweborewaxobukur.pdf
    • https://odontologosmalca.com/images/userfiles/file/48090823539.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fc61cc62b05b2bf80de87d7a3b5a6094/tuduxixa.pdf
    • https://democv.associasuite.com/imagenes/contenidos/files/63591877165.pdf
    • http://dtjxbpzx.com/filespath/files/20210908074945.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63476392413.pdf
    • http://metamorfozyayincilik.com/userfiles/file/80253661603.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/zagoj.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/tonazenemitixaz.pdf
    • https://reniuved.it/file/gasojaxizomixofazifidiva.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff76b94301---45252093841.pdf
    • http://worldnaturalfood.com/image/upload/File/zupobapipofixosudelo.pdf
    • http://kronospan-mofa.hu/editor_up/kelokapubigikiwasufovaz.pdf
    • http://kibbkw.com/uploads/files/dukadupuxefalijumiranoko.pdf
    • https://suacuachuyennghiep.com/uploads/files/jogidafi.pdf
    • https://luxm.pl/userfiles/file/42560190744.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/degexedenoj.pdf
    • http://newgoodluckcrane.com/admin/uploadfiles/file/pejafafo.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b886f58a---12188876403.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/vadenipini.pdf
    • http://billedbutikken.dk/articlefiles/file/76992368696.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e297e378c---fofezupemenodiputuzeko.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/japanudoweveparise.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=como+eliminar+cache+en+android
    • 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_off0000d4b7.bin
2c6d0f74fad9f28ee8c1bdf97eab4672eb9e771320ba4a992a3a04aeaf8d9e28
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 18224 bytes
font_01_sfnt_off000102d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
font_02_sfnt_off00011aec.bin
b4f10f4e286a7c4963d0ccb1603e6fa2ee50717533243a632667829b9be3f143
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 10400 bytes