Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54470707246c6ad…

MALICIOUS

PDF

84.6 KB Created: 2021-08-19 15:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b837dc17f492e23eb42115f103f7d2f7 SHA-1: 4fd3e43f37dd7ba564e033b27a07f9f1c4ea234f SHA-256: b54470707246c6adc41684fdb1e7e9723647860ec96339234c1e042496bde195
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious PDF, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=biological+classification+questions+and+answers+pdf PDF link annotation
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/64f613889a80de2c5f5ac16f308b8163/bopavovefijeserumipiju.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493271a20b---92642233982.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/09d52307ea6e15802628c59b7c01771f/42374346919.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kenesinepizalanez.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eacf472da1---81317470643.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vs5cq0cqbn7c4594db1kfa79u5/11721279277.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/jagetosoza.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/1759177373.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/fisogapu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f554c9e7a9---gupepepepuke.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/87915393339.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/dimakitebefobis.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f00c7c34b---44185343854.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d085628c1fe---kofosifebuwilonesel.pdfIn PDF document text
    • http://aweibel.com/Photo/file/momasowofadeji.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/mexuwe.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/53ab27008242648a4b9069ab9ebbd456/23907309437.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/38072285099.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0752d857a---zuvetinonumasono.pdfIn PDF document text
    • http://come2menorca.com/images/file/gofifabulozufixabotetul.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/jemifedikefisaner.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/48b6670882894c21c8ec317c71b03587/revemikuxafezezojuperux.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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 11180 bytes
SHA-256: 3351a0020ddfec88aed2d0a66622c222611edcc78b1024f5d956f37f02fe9850
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 16624 bytes
SHA-256: 9d340faac115f908894fd375b939d4ad054f5e3f8b5271c6b3d8f96cbd753d94

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