Malicious PDF — malware analysis report

Static analysis result for SHA-256 234211ac1e367e4f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 08:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81723caa96eb4e692942981332a377f0 SHA-1: ef062a7f14e059b181b5bfe3c62acfb3ab0776f2 SHA-256: 234211ac1e367e4f56312e384a592617ffea5268b708ea1341678334ff2be1bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to PDF files, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://alphaconsultinggroup.us/vpw/images/file/lemajezu.pdf In PDF document text
    • http://desushibar.com/userfiles/file/94333049968.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/zuxenutudosari.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/majaxam.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/36638604121.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/08268c665f5a4a622165b376248eaa4a/14949298350.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/eab747d6c92229330388e364ebd9f818/watunajarugalukomosage.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcbcf23fc6---76963314165.pdfIn PDF document text
    • http://vnplastic.net/upload/files/55912255841.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/jumoputopotaperazituno.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/88646413041.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608600c6ed799---45347213630.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/14362958754.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad842363083---31524000326.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/28976947660.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/lafosezuri.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210701094943.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/98105581577.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/83643796900.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/34070759148.pdfIn PDF document text
    • https://songhongresort.com/img/files/latagij.pdfIn PDF document text
    • https://siroyensao.com/upload/files/52545499182.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/44659069433.pdfIn PDF document text
    • https://soechi.com/userfiles/file/8984445391.pdfIn PDF document text
    • http://sgpeo.pl/users//file/binifixikinez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=on+my+way+mp3+download+320kbpsPDF 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_off0000c121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC121 11004 bytes
SHA-256: 5f4bd80f4af476bef347c4b3d58d9b702962d154a7f0308e77797ac77e4b5aca
font_01_sfnt_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 18112 bytes
SHA-256: ee315391e86aa3c0d7ecdc0cf27f668007399459bc5bd1f718acc93a00ca0125
font_02_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1