Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f757fe0d001011…

MALICIOUS

PDF

68.7 KB Created: 2021-09-06 21:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89769119ec22788293ea1e635b7e8ac3 SHA-1: 21b6496d52eec672518696d1792f737233e7700e SHA-256: 91f757fe0d0010113be0d9bbe696bac736e2daef257a3cf28ab49f2940dca6ce
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF is identified as an image-only lure, typical for phishing attacks. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious files. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://harmonie-avion.fr/actualite/files/gegewabutatika.pdf In PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/webufokanujegise.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3a93d34f91759cdd61cba75c301fbd74/1141159464.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/96317337393.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/tanibo.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/l0seuf3gsdo6ohqlda6248pv9g/jabolaxuloxixasivag.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/nurikevugizetejuvedimaval.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/luvudijuzijowukep.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/wivefogi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0o7cinkdhng34da5q91etfbij7/jomulawamosizetufujavakub.pdfIn PDF document text
    • http://coffee33.ru/archive/file/panoxobodafutemebur.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8ddd1c917cbfe4992178259ac297b92c/38806592583.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2f31704e0d91c616966b48420d3863fc/gukufotaxatav.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/fotuzegefem.pdfIn PDF document text
    • https://mmszke.hu/files/file/75051069479.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609da77d3a228---gabud.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hb5rdt3rr88u0kaaulaskjiq43/tebowilukadodurovex.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/tovogokagisovejidom.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/pigevapanepamebo.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/27058463103.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8493f7b61c---89396772618.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/82979677542.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/nevonibabodototalozu.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/vafelekorotutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=powerpoint+2007+tutorial+pdf+downloadPDF 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_off0000b13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13B 10800 bytes
SHA-256: ca308776715ed3b2eb0602b1a60445d47e7d3b9f83c914cd524a55d95fcc23fb
font_01_sfnt_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 14164 bytes
SHA-256: eb4c8d8bbd80ce3b207e98a50d5b28f67346dd559177e02e0269cbea81ee19a5