Malicious PDF — malware analysis report

Static analysis result for SHA-256 72db0eac2172559e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 01:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c21fc1ae72ab616f13ea43a2725a603f SHA-1: 4b86017339b6880531517b09c11d40a3692cdee3 SHA-256: 72db0eac2172559e08c61460705fbb806925ec38e12dfefc441ebc1b26393a2d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted from this sample, but the presence of multiple external URIs and the PDF structure itself are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfae78290e---bonuliw.pdf In PDF document text
    • http://maihome.hu/admin1/file/81492900818.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9977dc3fb---37585096585.pdfIn PDF document text
    • https://inks.bg/userfiles/file/zililasewabuvu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ioof3t9g5tgoptfj1ehju6qkd3/gafimozafi.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/10307425383.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/86881778961.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/32890545830.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/37476775024.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc268229418---dalikubawedegaraburabebas.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f6b8829c8acbabe2be79b295f943b767/zirafafizagubokeras.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/puzulurerarul.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/6625955132.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/79635390891.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a48eb6365bbea3086818571d4fa9fdc7/44098964257.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/49826856057.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3ee4e23e787fe30cd5c23f1f497d829b/85042961358.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sagasig.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/vonevogodudikaxedifatagut.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bb03da49---25481981736.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/55863283103.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/bofijubaxizixomugiwunel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=you+to+yves+crossword+cluePDF 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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 10352 bytes
SHA-256: 6f4317801e399e1b0877501160bf5c59e1e610cc5826b623a2b85f35b9ddbc16
font_01_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 17524 bytes
SHA-256: 43aaaac83197c5e558c3c8ea543f10952987e781ed1c7ab8db074084058726d8

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