Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bd8099a6599f36…

MALICIOUS

PDF

116.1 KB Created: 2021-09-02 08:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e0b15890387b9e24061678e78b7bd07 SHA-1: 3c5c8d0fb810cca558cd401fca5e9e2345e848bd SHA-256: e3bd8099a6599f36ee43e77f8cd2ca8589b13dc0f4404506405810e89f2a5a63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to obscure the true destination of a payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were directly extracted, the overall structure and URL findings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://upoart.com/ckfinder/userfiles/files/29250358739.pdf In PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160820e284b131---60998820758.pdfIn PDF document text
    • https://angkalaris.com/contents//files/gatesopet.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4a8100c4c9bde0698a38ae6e3633b322/ditowudob.pdfIn PDF document text
    • http://devveb.net/userfiles/file/suxak.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/rimuninab.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/kebetapezodosikuxit.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fcg0t3dqnvjs1nub5qusgkb7m0/75974212425.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/borifu.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/28638606142.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/pupesaposegixe.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15bc9f421---fipuno.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/vkn2qvnbtkheruvmh3hi3tuf2o/titepapekenaxojejixora.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb5c278ba---12151175192.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a9273b36e8c---bujopubemogeme.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a052902b273---85215362316.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/sesotikitilovofitutufon.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202106291717444253.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/7556521128.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ua0dvjal0iaijc6542gpquvt90/30846553247.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4a5a45e3---perawi.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/52296864844.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/denapabomumuruje.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d820a127cc1---gaxuloronetewoj.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aaf875d0c057221bc53aca22a2c24526/49199866408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+pe+hard+mode+downloadPDF 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_off00015f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8E 18920 bytes
SHA-256: 298242b6f402324c781ea8a5be7ee65c708a255bc174e69b8da1c56cf224bf17
font_01_sfnt_off00019175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19175 10796 bytes
SHA-256: ffcb2535337ca2fd20a8eefce3711ee4346abd4555922f7032236cbcb615a193
font_02_sfnt_off0001aa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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