Malicious PDF — malware analysis report

Static analysis result for SHA-256 770a802bc2bea3c0…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 17:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dc8d522458c2d88cbaae892ba387c5bb SHA-1: 939049709bceb92e0a8f3a9b6d93bb8e564a945b SHA-256: 770a802bc2bea3c0009d43f7efd94b498a764312bbd2d6ca2e712e6a8b4e43cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its image-only content and embedded clickable links, a common tactic to deceive users. The heuristic firings indicate a link farm structure, with multiple distinct hosts and UTM parameters suggesting tracking or redirection for malicious purposes. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://wastran.ru/uplcv?utm_term=complete+combustion+of+cyclopentane PDF link annotation
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32676540888.pdfIn PDF document text
    • http://ibb-online.ru/f/file/dijomasinenizurigafo.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/37867018774.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d784ac8240---15485592149.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/kakumejudorak.pdfIn PDF document text
    • http://iscelenie.info/files/file/2117806520.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/30718735638.pdfIn PDF document text
    • https://goodline.by/userfiles/file/dinesagevunale.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nuwotesofuxuja.pdfIn PDF document text
    • https://trieurodata.ro/images/file/xixibo.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/58193241622.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/36214418662.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/57939808779.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4c68905a7e82f16005c6a5098daed31e/xujojonawaris.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/4100602126.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/73801519375.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/gegupodinodujaguzim.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/wasafapebovavojepul.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/zabimurijipula.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/114941961.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/bimujos.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/49416176911.pdfIn PDF document text
    • https://aashianarealty.com/file/19511676326.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/23220a7963ec0a0636ce5db75b17392d/jajinabomeruv.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/41277656750.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_off0000af6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6B 14512 bytes
SHA-256: 88e9acb2b4f09c32d47ff08afe6ea203c40876dbf2b5eba319051b48dd9f6b9d
font_01_sfnt_off0000d38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 10928 bytes
SHA-256: a17df2d1feb201554eae7c265f37a55ca43127c53ef30ba8aef7da71009b9b08

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