Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a21ba7606cf5cd…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 04:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aeb1af5eb050f1de6394c1d1f4028c16 SHA-1: a93c182ee200a674054939737cafcbeae1836de1 SHA-256: 06a21ba7606cf5cdc55295651a277f2bf3e5fa7c52a17d1fbdb9529ec67054d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://c2ctrading.org/cms_upload/files/bodibixupuzaxaw.pdf In PDF document text
    • http://vietnam-intraco.com/webroot/img/files/45297753620.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7d315587---18414318132.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/84566216477.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/fuvumokolufuwedufuvalow.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/62003480279.pdfIn PDF document text
    • https://highrise.pl/file/35435346803.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/13b7cdea3b222857b6f483c051ac0ec4/56150532230.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/xuxomivoramubutuzipu.pdfIn PDF document text
    • https://okazionche.com/files/kodosudusirizir.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/jinimixozukubebog.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210904085253.pdfIn PDF document text
    • https://clubon.top/uploads/files/xaxizizuromor.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16132696384109---pekelotesisiwuzularinab.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/56144175105.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/notesalitojedovu.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/89310215368.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/56216558672.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/tirujunenewodekufor.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/33765627441.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/26522655837.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1314a451---26753161731.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/79800168749.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/xakelonogoxefobe.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132b055dd99b---vutekiwat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=xender+24+mbPDF 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_off0000b816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 10068 bytes
SHA-256: 1563572f0c5fd3e0a2fef7e25f83e4ab4bbb00bf8c21cfe22e7095802e6cc1e8
font_02_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 17524 bytes
SHA-256: d9edc4247353526b0e551924b73a8b28623163bf3c249ff392c08884ba5bc73a