Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7561c4e966de1f…

MALICIOUS

PDF

74.8 KB Created: 2021-10-07 06:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dad46dea74c89115156d03659c4a81c3 SHA-1: f603cfdecd0183377d8ec56c697479014033a85d SHA-256: ed7561c4e966de1f1fb0467caa916b9bca5ee098f17bf37750dab96d8f50ed00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inspiredindianfoundation.org/uploads/ronerononovinovigod.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/48ba5634b889d834ab2242b24199f47d/31120661512.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/91811337019.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/zevelasuxalikagulokuk.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/18584422384.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16151627241b1c---11614506663.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/16766387427.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/60275069260.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20211007_081241_105.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/lalijawebupoxalofilagajid.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nupiteforatibajuka.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/rikixibixenelulozisite.pdfIn PDF document text
    • http://faradbox.pl/files/file/pumozofete.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210918133358.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/rapexileduzowekepeli.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/vaxitaruxolitafe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec849952b---7870158035.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/45289006592.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/9852421317.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/25079655934.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zofiganizi.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/9828312035.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/xijezabuxoridenod.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16159b542afc8a---gukot.pdfIn PDF document text
    • http://minhanh.com/files/xilukisogemupikira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=spider+man+far+from+home+hd+streamPDF 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_off0000bc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC02 10792 bytes
SHA-256: 5aa926d3e89f1592e4b586765ab1808cc71eeea98ecc2e440dc6d77530082480
font_01_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 18264 bytes
SHA-256: 007465b72cec87806e72ba468b6c00964ceb44a8f223712ff8b554fa0626acc5