Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1b1e564e5eace1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 16:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c99f1389b527c11959d733023556e02 SHA-1: 1f11f4dcee0589e89387fb12aa6d375b95b95b48 SHA-256: 5a1b1e564e5eace1b34e9fb2ded60da99f58db4565efe0424347fe9796ecba90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves using these links to deliver a payload, likely a phishing lure or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/cv45mvdgp0eidea58jbud4bkjr/39470947041.pdf In PDF document text
    • https://watertorens.nluserfiles/file/zotog.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/62550975613.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bewuwawe.pdfIn PDF document text
    • http://gbagencement.fr/uploads/file/mixabalevafawevoka.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/xavogi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ae3793842---75678292299.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cdd0adab6---padaka.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/29b4be46053d4c4643bce904f7e07ec7/miroxoduzokexiwamowegew.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/gr86hf6407h265knk54bnqd0a8/tusebupolewasozagujuwok.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c15bdc2cbc1---98051427695.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/70730448212.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/penavodi.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7b2e924228e98655c553b788694b6ba3/1921776685.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abcc24dbfc---79582082786.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/07c08bceff55c3cb3a0d240075af4b39/58596456277.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c150d9b9134---81605707376.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4fdf99b9f2c24f102a4f28d5bb58f1d5/xamubijazugogurogev.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/57535897821.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/logawakexekos.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/pexofotesaworawiwitevajos.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/wijuxedusuzufuw.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/70848491491.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/55825407724.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/68341939189.pdfIn PDF document text
    • http://hkwwta.org/userfiles/befopadopiliwujavekifaz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab954596298---kefufekoroxiwonexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lisbon+metro+map+2019+pdfPDF 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_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 18384 bytes
SHA-256: f0274d4d5420b9f0195c9491c2046d4a23606ac23c98c1a2dd52c6136a5014d2
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 11172 bytes
SHA-256: 5b1ecd9cb232fdd2cd56c26a6dcf2d7abc442e5b8a6bfc0f57714b3910391290
font_02_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.