Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2164355be671db…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 07:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9e2f13db2e98170e000f4cfab567f169 SHA-1: 0695471ea4ba97608f8b88e7c40042fb001269c1 SHA-256: 7d2164355be671dbcc495f504b753367061297e07ee0c5596a37cc3b97479161
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The presence of multiple external URIs and link farm heuristics strongly suggests the intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 5

  • 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
  • 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://urparitet.ru/admin/ckfinder/userfiles/files/konigawubipeloribasitemor.pdf In PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/91874304642.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0077265850ccd7c79cef6c439a6af783/70148710279.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/buwolevezojevag.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/nemeke.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/tepimeresujawadib.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/37205282871.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/wakigekuz.pdfIn PDF document text
    • http://mutitar.com/user_img/files/39684022434.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/91011985460.pdfIn PDF document text
    • http://tavio.su/files/file/jokadezok.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/xamis.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/53d1943741a623fae06c47a030ec5797/56082107942.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/xokaropanepimen.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qca2cif312gpl8dr4os33tg9qg/sonotu.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/wogofiluwi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6f3aa23a---45047007224.pdfIn PDF document text
    • http://rapet.hu/files/rivuvomebotixakox.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/jujitodajutawero.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c0ba7e8b89c3181bb0f7d4112ddf0a95/vodamumebukatesisu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/19989c06843fea058d752fbbc868f479/fupesadawenaretufoxa.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/letujin.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/31482819926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=rider+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16992 bytes
SHA-256: ada7bc494a125611cdf5d9f4787d1f9aec708ba8c61b67c332c8db363f44a811