Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea78c807b2575c94…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 11:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb568ab168a28554f88bb7364df96b64 SHA-1: 995cd2bd28045d133168eb321c41d016fb1d4c70 SHA-256: ea78c807b2575c94cc1ec35260be0bab652795da43eaedfb787459c29e0ab236
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic for phishing. It contains numerous links pointing to various domains, many of which appear to be compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.jindatunnel.com/up_files/file/fatupup.pdf In PDF document text
    • https://skiclubraonbaccarat.fr/pdf/18564830746.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/23727905390.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/bilipisolawasuromubozores.pdfIn PDF document text
    • http://ilovestory.com/upload/file/78650891619.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/lidudeninenotugajivuwofig.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/wagowowibitenabu.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109210005383584.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a8753f86b96848f47b2761703347e47c/zoravep.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/pogejikigijimomoxa.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccc602a644---16782234669.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/13796446083.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/vuwetagol.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/tobediropapode.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161418da4cbead---nenofinarufatobunuvib.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/69455405161.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/pumefimego.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/xosobosumu.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/87575339636.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/28529592060.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/57945049743.pdfIn PDF document text
    • http://lactopad.com/uploads/files/15339340152.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/94480201311.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/kaseguvugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=two+main+divisions+of+the+central+nervous+systemPDF 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_off0000b01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01D 14212 bytes
SHA-256: 7de0040839026ba1cdf6538af1f0e829527a76c93a63291154da2e208e267f9e
font_01_sfnt_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 11068 bytes
SHA-256: 0bd160353160a07277732b8ae94e8b3e785003b0549005351904d39fdd119735
font_02_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1