Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecd2f584c794468…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 06:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2375a5be7c075c7b82af7523c9972672 SHA-1: b1d9c5a34d9d741592ffdd92b7fb101db23a09bb SHA-256: 1ecd2f584c7944682c21d6ecf8e2096e39e16aa852c05c3ffa4180469e683c36
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings confirm the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://crewmak.ru/uplcv?utm_term=irregardless+is+not+a+word PDF link annotation
    • https://shevtsov-art.com/uploads/files/gexarilelesebijetib.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/70472102792.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/43203194563.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/tudusajixawogaxagag.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/93478583867.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wedup.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210918080749.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/rufadipefowepesuvimofep.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/769059346.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/69196683394.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109100619542059.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d08a359527a2ff378a30c2f161cc7be3/vovosarejapule.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/jifexuwapev.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/93800518204.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/73775155205.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/41850751316.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/fetunalub.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/gesexu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613716a3df8c3---bisemelodavipojuv.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/2907424905.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/lowapevibegarawofemeg.pdfIn PDF document text
    • http://artospace.com/pics/file/mujumitagonezibaso.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/13855752488.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/11665623659.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/29499ea0391bb6d2cea7fd0d2bf25c61/seviloxivigabibetanulim.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_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 10460 bytes
SHA-256: 2eb86122a58e7d70323217c77b969b97c8d6c4c7a83804e79176021899553cb6
font_01_sfnt_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 18160 bytes
SHA-256: 0447af89055d6906c0c7fe6bb9fe31cdff3957d28246c7cfa84c3c33c402ad4f
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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