Malicious PDF — malware analysis report

Static analysis result for SHA-256 74498026955acd3d…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 07:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66a36c456b8dbdaa0483f32eb5656db6 SHA-1: 88ca34e88a1711ca3968829fd91565fc28428f04 SHA-256: 74498026955acd3dd3a6bfa20d9c3d4a1a06da6eae0c85039eef061f4587911c
96 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs that point to compromised websites and potentially malicious content. The ML classifier strongly indicated maliciousness, and the heuristics identified it as a link farm on disposable hosting, likely intended to lure users to malicious sites. No scripts were extracted, but the document's structure and embedded links suggest it is part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=how+to+increase+spo2+level+in+blood PDF link annotation
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/64039476288.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d5abe3893d9d19b93f7033548ae2d26a/gakuxidonumilovuki.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6083a9e2---fetudepaxobureburuges.pdfIn PDF document text
    • https://aromamarketing.md/img/files/14998455845.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/letin.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/49188924235.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/72534200838.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4630b655520ce3ad02fe1c02d95f1053/54170609179.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/87722621077.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/11475052487.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa949696c15---66718691827.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gudinipomexeniz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/94be304daf38fbe8f72c698e4b4ebdd9/51473616464.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607606aa49522---dufomesuzugo.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/55713582860.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/bavimibubo.pdfIn PDF document text
    • https://cooperspick.com/files/jupexipimuvuwedurev.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/sifaliwavojadexitub.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/k3gedf6mrmfo0cenc1a1cde2vp/25412120152.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/51987450896.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/wukurirumemejidulejixawiv.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7f6cf9c3---vesewuzijisikugig.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/dozosukapaluv.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071748844dd2---lukowisukemafavipuga.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_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 10908 bytes
SHA-256: afcfdfe737eb3dae626e1da11f6cc9817114f15b4ca0aa8d648722f2574b6e5d
font_01_sfnt_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 16068 bytes
SHA-256: 6caa4b6a1ce6528d9ae149b305a576ab255554ee98d87493d626e464c589e2d9
font_02_sfnt_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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