Malicious PDF — malware analysis report

Static analysis result for SHA-256 e735b775345c4e2b…

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 04:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82c02146f5e0c0d94deb3180b2890317 SHA-1: a3d6ae2daa4f602753b48ae31225ad088c199856 SHA-256: e735b775345c4e2b1d6870316c61063d65b231b096705b2bc9f30cbc9c7db5a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites, potentially as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://copingconversations.com/userfiles/file/24205065564.pdf In PDF document text
    • http://rc-modeller.se/images/file///ropemebajevokatomuto.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/lekumoxugerosajugokokejez.pdfIn PDF document text
    • http://na3.it/misc/file/72347816095.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9c91b11782b8ddfe86513ab4c0480a21/kizimo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/50050066893a54023906357467ce79af/kaxopofipejefelun.pdfIn PDF document text
    • https://menu2uplus.com/images/file/77966511428.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/noxojebamotewagemevoko.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161210583da434---88283785023.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a85d9b089---satogosugi.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/20520702963.pdfIn PDF document text
    • https://maviet.vn/upload/files/92050837880.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/34473714287.pdfIn PDF document text
    • http://premium-h.info/files/files/doremifijexopejojapuf.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfb32618e4814350e0c15e3d0e9bc3ef/dulipibugabipomoz.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/44505482093.pdfIn PDF document text
    • http://18554080.com/userfiles/file/sadumajadakubomopiwa.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/acf8b1536499202caa8d9d9494180a96/53150227518.pdfIn PDF document text
    • http://mariancozma.com/_user/file/fevez.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/52473178508.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fogonutaniveparoxonoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=maths+multiplication+and+division+worksheets+pdfPDF 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_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 11224 bytes
SHA-256: e5ac9776642e36728c0fb8f130d0f088d109f603db53af0fc92d3732a2a14994
font_01_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 18384 bytes
SHA-256: 1b434a68b21811983282e9f3ab6d2b7944bb0a87e2fdaa1bfaf65d3fd86f9ce2
font_02_sfnt_off00014262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1