Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b06043c1351fa2a…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 22:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5f12a071b447d4668c09422f8a11d54 SHA-1: 5a80f0281a9342a7a9beb1ae62c436d582f2a1d4 SHA-256: 5b06043c1351fa2a7b15903eb416880b0f403583285224c36e70dde81f559509
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://cructi.ru/uplcv?utm_term=5+pounds+to+aud PDF link annotation
    • http://dakhoanhanai.com/images/files/48498569809.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4cdf22f83---44869122601.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/20081215960.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/moxenififupabesiturubef.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135273680d3c---kifeletef.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/nimiluzefidifigi.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/49832406406.pdfIn PDF document text
    • https://chp-travel.ir/data/file/26948936741.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/bofilosifonod.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/52706791538.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/63412546669.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/83779633338.pdfIn PDF document text
    • https://makenie.com/upload/files/77457907445.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/beratobelilumala.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/wewobu.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/rozukageketefotikonu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/xidovugisatisitogaji.pdfIn PDF document text
    • http://ridendo.cz/files/file/xefizajozidunaba.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4a2168235c1236d20d050152fbed9d61/xodewer.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/nemixe.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/34525075496.pdfIn PDF document text
    • http://epmachine.ru/d/files/zaxapudozopedivu.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/bujurasu.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/44347815583.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/xodopisok.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/43841943024.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_off0000b416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC28 15208 bytes
SHA-256: 3e1afa1c1d68c25034fe21ce2c8bdc1d061a550a0953e5161f2413ef8822535b
font_02_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 10152 bytes
SHA-256: f6812c3726ecb9645ab24671715a85db231736f416937f7bb3bc5ba7a0b6857a