Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b5f7c019c6f5ed…

MALICIOUS

PDF

90.6 KB Created: 2021-09-01 16:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd4e0e272826bca3cfdedefb7da39b64 SHA-1: 134cadcc17246048f9c1f8cc9e361d8d98e95f12 SHA-256: 77b5f7c019c6f5ed37422a5a1af9edc2334e0ebc596d14434809ef1a2c57b9ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The high-risk heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of distributing malicious content through these links. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d574539e---vekomafuvapok.pdf In PDF document text
    • http://morethancars.nl/uploads/edytor/file/33214359296.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/37187740504.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dudofo.pdfIn PDF document text
    • http://flexa.cz/docs/file/1467584850.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31e9b23697---5553593934.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/mudomirosedul.pdfIn PDF document text
    • http://parilka.by/var/upload/file/kirimipebaxuwimapogu.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22285669168.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/13091418465.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/28912319876.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/lolawajiviredatoda.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/jugilivuwunetev.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/fonotonavelazeniwenalez.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/51f59a43945095a29c165c1d53acae59/53572372766.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aadf3c3a7---zavotolegikiwigudibuwuw.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/xuwizi.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/8422243825.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/21934445648.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160829be244603---43318661191.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/15165013652.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fcb7cae9f4---9933495300.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/ranotegupesigupiwinugos.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/40486540060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=praise+him+with+the+timbrel+and+dance+praise+him+with+the+sound+of+the+trumpetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16192 bytes
SHA-256: 6958c16a4e652a713da5939da95bbc64a140c07236b1f16037a0eda0e4f3be8c
font_01_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 11212 bytes
SHA-256: 57935a9516534a6c3a6c94ec8ce74f0fff8b19435acf07859350ede1f286ddf9
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 21328 bytes
SHA-256: 514e428187dc5070bfb3601beab3b89b845696586aef4eacf3ecf7776e994850

Open this report in the interactive analyzer, or submit your own file for analysis.