Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2c98e6e81f97ba…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 01:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c40aea518c71689fe59506b6bf1b4e9a SHA-1: 99c880a35157fccf0ec9c1426358264514d0c5be SHA-256: 3c2c98e6e81f97ba1efccce20f15f41cc8f2d7837f531dca0b799980e65f216d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://jkohut.pl/file/50127211323.pdf In PDF document text
    • https://norservis.com/files/files/xonasoxibefemedotuzo.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/51805237459.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180448358031.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zakifokokon.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bff9744cd18---41442444152.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/gukag.pdfIn PDF document text
    • https://egf.tw/test2/images/file/99424730422.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2b67ca2ee2cd34335a5a57db0c62da23/54847255380.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbc7862972---70261807644.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/47212425597.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e5d5f27fa96896147167d89caf763517/kabig.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/sewunejuwok.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/30130534557.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/vekiburukomujos.pdfIn PDF document text
    • http://xsteelstock.com/d/files/48253604889.pdfIn PDF document text
    • http://starma.pl/files/file/1728600487.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/60720443335.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/nexojife.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612a72efea193---87378757973.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/38852baed029542a3c4e633464fae650/1314142451.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/buwafezediminafubevuru.pdfIn PDF document text
    • https://eternalbliss.net/file/65576140660.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/56284545785.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/10727334727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hard+disk+which+type+of+memoryPDF link annotation
    • https://lapdonline.org/file/89543120190.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_off0000c644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 11016 bytes
SHA-256: 074639c2ed9b92dd6e61ec23da025653bad45103fd64c5d299b02e11d8ff55dd
font_01_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 17556 bytes
SHA-256: 17e543a6a252e51a125bc7754d58cae6b34b95a46efd218347e5afbc81ac0000

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