Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a40aa34683327c1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 04:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7eb01f997ec07aae52c81ecf4c22faba SHA-1: ae3e17129196f5a248c0e9f302a7a946d46ac37e SHA-256: 8a40aa34683327c198a129115a65e8276418a93f243d1ba105792eccfa37addb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content. The presence of embedded JavaScript suggests it may be used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://cructi.ru/uplcv?utm_term=oxford+english+for+information+technology+teacher%27s+guide+pdf PDF link annotation
    • http://ahkkpcm.org/userfiles/gigerokasonuxum.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e341761100433bff304f270ecf16fec3/tenimu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/87090944963.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0faf4b6b2f---livodoxitudogozanetaziju.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/98863629636.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf476dd0555---47481151609.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/27228795378.pdfIn PDF document text
    • http://yoron.net/up/files/98710485587.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/96312949662.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/afmvn9p1ti3h1q46frb98fstl4/vajit.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b2b3d245---39443847067.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ef0bb9664---fenorijofad.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fb653a959f2148fb558411e9504e11a1/21580202782.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/jusesejupivibufabade.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/88016173680.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/bemaxasijugebi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131364fe6124---silejazujepezuzunivur.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ffe24b56---62290003614.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/funupalipemavexe.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/rimejivovu.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/wipojunubegagituruxetoru.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e9428f50975d4125509054293a445cb1/43728748238.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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 11440 bytes
SHA-256: b1d7ac7ca90b80ea1a1a7dc7e7d6e590f78a9c3c40d81fa775d58e31129a84b6
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 17748 bytes
SHA-256: b1a00d6f0e1f1b1620d4571fc67b747a9cce75c6b55c5ff5cd0990368acf1532
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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