Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a57d914b3d0f741…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 20:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae1d67d2d041c0e0ea2aa7541aa92dbd SHA-1: bad9c350560042c730b61204b966102ae444cd1e SHA-256: 0a57d914b3d0f741942ed3a1c4ae6a888b334d311bb9da2fd4b0166c2772e8ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=new+york+minute+watch+online PDF link annotation
    • https://tommytest.dish1314.com/data/html_editor/files/mopupabu.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/29765289471.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///98488532600.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/buwikiwizeden.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/kidogijata.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/74997349487.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/35217132832.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/danibapasewus.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5e12582e70d894c267b086d42dff02c3/43020224877.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/xalaxunudutitopanujujetam.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/mejaroturowed.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/56573810557.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/uk3r9ok094s54m9032dm6fibrk/jigusimo.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/81255356699.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/89224151895.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kisukenuvevatikos.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/wokisowanifi.pdfIn PDF document text
    • https://clinicscrm.com/img/files/81823434831.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/lumoxekakudokix.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d7f07be20---76058733729.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/wefexepora.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3279f3b457a4b4e7b357daaacd479dc9/puzesavadokov.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8d2d136058582c08e9ec25e57cab759b/kavuxemimab.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/wobafowovidedoweluf.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_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 18048 bytes
SHA-256: c1442ca0027a0c221c0ce0f2ad32c6ba8cbb6b28f94fb2bb4ad4d5e5da79754c
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 10696 bytes
SHA-256: 957053dddf825719782f90fccf0520ee945c8ce982241ecbe9138d2e2ebfa8cc

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