Malicious PDF — malware analysis report

Static analysis result for SHA-256 28450c42568ea516…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 23:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b57577ab09b4006186d472215e9c9cc SHA-1: fe9ab07ff3891691910a2944fb537d55b53561ca SHA-256: 28450c42568ea5163aac61023b1b5403d4eb06be216a825a8e6badd7a42e05d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely serves to execute malicious code or redirect the user to malicious sites. The link farm points to multiple domains, some of which are hosted on compromised CMS uploads, increasing the likelihood of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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://queure.ru/uplcv?utm_term=garry%27s+mod+deathrun+maps PDF link annotation
    • http://www.web-globus.de/ckfinder/userfiles/files/44992148971.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142247ae8e18---92332636922.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/92400677968.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109071454373958.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zewufegepotolim.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210915174742.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161458cca704e6---75434982489.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/pofag.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/27973203756.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/panepebulowu.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/37633596007.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/75459254103.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/sofesewipeguj.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/31228046064.pdfIn PDF document text
    • https://shevian.com/images/file/tunurukopipotomoxevu.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/62972596360.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/15117968655.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416dbba9194---35854923475.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/guzinusobawi.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/46444382486.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/77831907915.pdfIn PDF document text
    • http://rongqichem.com/upload/files/kalakatigowajoxuwe.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/34867139638.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/44593420811.pdfIn 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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 17732 bytes
SHA-256: 4e0f0e7fdd5517a9f8d352443d63d3602eae4018c84d84a432c120f886ae477a
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 10804 bytes
SHA-256: 81a7d405e61914440cff3d1867fda094cb1b1c8e5614662036507f902bbfbabe
font_02_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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