Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1ba0b7927fb29d…

MALICIOUS

PDF

68.4 KB Created: 2021-09-02 18:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0270f8b997468bc1a0b084ccc134877b SHA-1: bb9458fd4c2e8426005920071d772c1dfb9b938c SHA-256: cb1ba0b7927fb29dff143e98e045185e6646e583b8b3873f8e70b71ed8a5743c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure and URL patterns are consistent with phishing campaigns aiming to exploit user trust through deceptive file names.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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.
  • 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 https://archism.ru/uplcv?utm_term=jurnal+gangguan+metabolisme+lemak+pdf PDF link annotation
    • https://businesslife.com/content/file/54869645945.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/kiwewoxigij.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dfee98ebe---25823435782.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/18a6d4833480cbaf1d2b1c443f058eae/rononodifo.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/lunexosexitokadokibebut.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/sibotilukufu.pdfIn PDF document text
    • http://arerp.kr/data/file///lubezubexuka.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd227fffe---80569302533.pdfIn PDF document text
    • http://gestmase.com/media/images/file/18432981097.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2980ed36---19219462806.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc64bc6c81---lufuw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610c6b494a2f2---berik.pdfIn PDF document text
    • https://petikdaun.com/contents//files/17596981060.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/50090858163.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/kosatilodinapifavudep.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cd571edd---64090079717.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/19035093658.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f99e5cd587d---fapakaruvagenake.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/18292857969.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210601021537.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b46bf88ffe9---vedolumulol.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/rabivep.pdfIn PDF document text
    • https://doi.org/10.36656/jikm.v1i2.293In 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_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 11164 bytes
SHA-256: 34e9932ac09b490f9f8c970b7bfc19de5b9637db0bd3d60595c29b74a0f7469b
font_01_sfnt_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 14224 bytes
SHA-256: 44265b86b344a23309167ef1ceb5a50a2c584f15742b2b3ac2117fcd2b8e9267
font_02_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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