Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21e5cbff6024699…

MALICIOUS

PDF

84.2 KB Created: 2021-08-19 12:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce12db6a87a3cefa74c064c85a614e8a SHA-1: bb5860d5be5fe9c009097cbac01e4f817946b56e SHA-256: d21e5cbff6024699c82a4aa3cb68847574f42a47973cde9f63832fd9ec73f43d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic firings and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=the+boy+in+the+striped+pyjamas+full+movie+download+mp4 PDF link annotation
    • http://promocode.lu/userfiles/files/92734692441.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///86488931878.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/64ac1ba557094df66b4deff0e7d60454/wotasinajexuma.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/61748353165.pdfIn PDF document text
    • http://esistore.be/userfiles/file/37643928349.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kepubexegi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d88d8d5ef---lapoduwasowopulemiwe.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bed55ff83---tapowefetixo.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/78046944253.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/petenanofowi.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/waxukef.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/retaz.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160926dda6e974---fowikujiw.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/jawojewoxefapat.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kubusamubokaxininipubi.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/23865810882.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/munuvopazetabirezofi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbdb95c06e---39641318913.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5a6bdd8ecb868a5023ca02deec3c5ecb/33856289853.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/98297843623.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/devirurivarum.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/71655447271.pdfIn PDF document text
    • http://teraval.cz/res/file/79188595742.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/8023875829.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p3j3v7mk119n8fc6eb65datmnb/movokitelolokava.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fjdghbopqcdtrnt20rdvha8jit/motadanazasulu.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_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 11440 bytes
SHA-256: 8b2e879e0f5f8f374867cddc855954ff5639ef8ab6243a3035976737451d33cd
font_01_sfnt_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 19056 bytes
SHA-256: c0116d352f988a2a7abb027239bda32b87f9ca7227a0015769da9413b8124bb5

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