Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e4ad9dd5a5f01f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 22:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d2df798eaa53a2b4f18a9d2be1b20c7 SHA-1: 40a3f62e496690439f368bd291b69ab41d661711 SHA-256: c7e4ad9dd5a5f01f39d64ba102a4241833af4dacaac32f06150e3c63c4042e44
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=present+tense+past+tense+worksheet PDF link annotation
    • http://bimbrlata.cz/UserFiles/File/mosoz.pdfIn PDF document text
    • http://xsteelstock.com/d/files/37396724156.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/61643432068.pdfIn PDF document text
    • http://hejia-ele.net/upload/98862734635.pdfIn PDF document text
    • http://bdn10.cz/files/file/97922709927.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/32ks6uam0t1545b9v43j9ftge1/12093727754.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/lameriresaxitatalevosej.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/93636288261.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/vijurefisanalozotoj.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/92715623724.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/wugizafu.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/82013022760.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kijufekowesozilunevadojo.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/51175837623.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/bavuwufovegadasol.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d1bd1fae1---55697343199.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/36067474318.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/sarafi.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/jitefiwogaperedevuli.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/55290775196.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/motexu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d952ab43---77998726553.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/73101694516.pdfIn PDF document text
    • http://jljemc.com/upload/files/13345959519.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/2027301457.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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 17468 bytes
SHA-256: d59aff6319176fa2c76f9cbc6974d5f8ee622744ceb2e496d0374f569d805c1d
font_02_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 10392 bytes
SHA-256: 1c0e878b6f84e4ba97e569cc073d254a7d17e24c9451c85d1c93e3b10147f1a3

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