Malicious PDF — malware analysis report

Static analysis result for SHA-256 377c0199749dbadc…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 23:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8dd5e82d001491b39c6408ceaed88c2 SHA-1: 829ff799ebc2e62c318962ce79b431db03e170f7 SHA-256: 377c0199749dbadccf08e8b103a6e34e0b55d24067eafe5c0a1a5f4959283b6b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms. This suggests the PDF is used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6bd5410ad---tagulop.pdf In PDF document text
    • http://eraldocomo.it/userfiles/files/pabewixijavejufugidokaxaj.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/17610721569.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/16936718822.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/kegutelukugowimas.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/162712415696e4c04bb30eaf83385d.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/64e7c30aaf1908a7e5d3b53e1e6f97d9/wexukisigoxelokezitaj.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/88849462536.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a95d3f2b18---68033555624.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/880903087.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/43913035072.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/55521763669.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ced060d9507---wapugigegosedurimu.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202108100152003870.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ouqljcimg3irf1p9ub5atk6pa6/jibekenu.pdfIn PDF document text
    • https://fptica.ru/images/file/75246186996.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/gesuv.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a104d1635f---95640088559.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d769dd9d198---482572605.pdfIn PDF document text
    • https://senhewood.com/d/files/vefijorebimudarivunojesu.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vn6orbnkp8ek0id48lvljgsppo/5628118145.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/57283505953.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/vgnuuq1j813cbnlenlasqknlh4/tazutefurikosisunezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=year+3+literacy+worksheets+freePDF link annotation
    • 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_off0000b38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38D 16372 bytes
SHA-256: 9df3cc33253d71adb2d82b511ae9095371b654cfe6754d7eb11cf31bf23ed312
font_01_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 10776 bytes
SHA-256: f2baed1160287ca13b49174c594c57aab8cb579bb7f8e4d3e321ee95ec994976
font_02_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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