Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb5902ffd681666…

MALICIOUS

PDF

91.5 KB Created: 2021-09-18 13:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9cb4623301bb65432609254eda819e2 SHA-1: 6a7e69dee9d191f904ba8372d8d20daaab07938d SHA-256: 0eb5902ffd681666764d4853117c4433475716f4c3256ed04df9ff900d68467b
172 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads or visiting phishing sites. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=best+step+tracker+app+for+android+phone PDF link annotation
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d835cd5f---rifazol.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/29193162558.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/79811614883.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/wilerusafosedis.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/wezuguxekules.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/71071223276.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/6426570383.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/824490881.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/dezaxotujamemuniga.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/dijofuwonojawunagogevufon.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/18158591998.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a860c342---kudokevuxu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tanabaz.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/88429500544.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ij4mi8irbbfvnhbebnajo54tn1/51746802403.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/zorugibenepefuxixibifij.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/94195013977.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44842297436.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/31415540137.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/pamakewelububus.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/texibumuvewupajabevom.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/fajajanuvoz.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/nawagikoniwobejajo.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_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 18784 bytes
SHA-256: 9659c4df23d3a2376733f55859043f605dd68bfb7f341823629980b787bda6de
font_02_sfnt_off00014776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14776 10816 bytes
SHA-256: 2a8b323646d302c1f74e331a56f3bedbe836723e2f304642c8a97eaa2647368d

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