Malicious PDF — malware analysis report

Static analysis result for SHA-256 847a678e8bb127dd…

MALICIOUS

PDF

87.3 KB Created: 2021-07-24 13:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1ff9f935a9fe66aa6b78066b64b84c70 SHA-1: 86afc135df64289dcb8fc18737c972950eab8fb4 SHA-256: 847a678e8bb127dd614d10269ba33d49c25f3dec65301a47d50fa98f6e10adb2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. The presence of external URIs and link farms points towards a tactic of redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://jagodkaprzedszkole.pl/userfiles/file/83862270093.pdf In PDF document text
    • http://apsara.ru/userfiles/file/magowotulowixuf.pdfIn PDF document text
    • https://digireg.sk/upload/47004530380.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0b163631---lepavanedunuzegi.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/79702955170.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/fg51ag5g671c6lvvp8tf3lr44d/xokuwerolaxebafoxar.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/4811418489.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/30942795450.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/jorusesese.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9ftf4et00aokctrvbuba2qgbb0/57316446196.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e301582ad---45876872943.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/3865278220.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/58959474876.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e74336d594542e2ca7b0ce1776a17755/91544596371.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/55759512632.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ae98fce43078a5ea084b20b078a4dc34/42780763997.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/71888675272.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b2o2o451342ck98s596r5alog4/sadovevilufosu.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/zotapewuvugolekagaroguf.pdfIn PDF document text
    • http://hkalc.com/userfiles/wuzeraveme.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/43492930361.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/gurobelokopotetisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=non+verbal+intelligence+test+pdf+downloadPDF 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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 17376 bytes
SHA-256: c0a06d9e1bc7098598267b586b9656f91d67a1b46b5ed6d5db44cea56449e018
font_01_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 11064 bytes
SHA-256: 0850a76f0e2197bc79fc8b775daa02d7f6cd5dfc6ecde37dd2539abf4bef6eda
font_02_sfnt_off0001372c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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