Malicious PDF — malware analysis report

Static analysis result for SHA-256 8725c764897ccd0b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 11:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 038bfeb03c62843b476142f64909fc27 SHA-1: 809b934c504044a7d7522ecf872eaec9a13e8512 SHA-256: 8725c764897ccd0b8cfb87c32e1b1b27d28a5d6d139ccaf49eec784d92b83ea4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into decrypting a password-protected archive, a common tactic for delivering malware. The presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, further supports this. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d6b1a6ca---85599841755.pdf In PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/98740307389.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/fukezuw.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/refuwotatamevatipokaxenep.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/fusurexi.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/subenopogeboxu.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/monupuwisekodupujanadoge.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/63974946758.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/wamokodirali.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/48130246665.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/28783460847.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/37a569664c00efdf96e1e36470f4801b/sedupetenir.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/46451292198.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54039532826.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cf05d53a2307b4f6bbf6fb8d05ff7285/fopadir.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/sulimixixurutigizi.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/xefematiwifuki.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zefidewanogudeloferub.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/mutidapuf.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/71092336052.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/16115265875.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/21264316397.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/73801519375.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/3765475674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mac+preview+remove+password+from+pdfPDF 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_off0000c543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 17628 bytes
SHA-256: 2f628be20809e7aa0035c96da3bedeac0a591932c9d6081c715e86e7aeddaf3c
font_02_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 10680 bytes
SHA-256: 03d2b59221c6bc9147a6c1ef1f2ec80ca1c6bb7a0844b8d753aad19e0c8b6d50

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