Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7df3b512a68567…

MALICIOUS

PDF

107.6 KB Created: 2021-08-23 10:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32d1fb2ba2e95849d43849dcff69c679 SHA-1: 80b5f74ce8778148b3172c4b7a9aa7368d987f3c SHA-256: 1a7df3b512a68567cca752e51fd3cf1a16fa3f8df279c18265d74bca806a92d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to other PDF files or potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://ketchas.ru/uplcv?utm_term=twelfth+night+questions+and+answers+act+1 PDF link annotation
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/meranejixodatiw.pdfIn PDF document text
    • https://shibbirs.com/media/files/37802470052.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/73021957943.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0df18d4e9---tefigolegovomebakakikom.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/dasaveboxaxatevekovodori.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9da295601---kokazikonuwabigevakes.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ov0h0j5gc7copdme57f0n9vre1/varijuwegobudakabepaju.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/xuwadafaz.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/69630591986.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/r88o44kv1cu77f1odg1b3rcisi/51153100152.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ca22b06fb7734c270688cdda941fa3d7/wezukunividadozogesidog.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4igch88n5glnit388t127gbcl1/wakibip.pdfIn PDF document text
    • http://terrietanaka.com/library/files/97892800640.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/safasudidowimogub.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/6745968841.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609de67f5f4f1---40897258246.pdfIn PDF document text
    • http://cssh.es/img/file/wuzuzelotafonuvazatunasim.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd4602e1b---96064183343.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5dffa354b899dfd2191af895a8550df1/kaxajimugexipija.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbb0359df---61776939302.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/73570552125.pdfIn PDF document text
    • https://p87.hu/files/33243925447.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/67079411671.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/24a92ecce7796baacb6984e0f012c1cf/51045805453.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/keberavikivu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ceefb6828---71272614787.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_off0001413b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413B 11100 bytes
SHA-256: 48e049952f19dcfa176d97449366e31e07bc7fe8ce80286a776b8ce271cf4290
font_01_sfnt_off00015aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAD 16984 bytes
SHA-256: 9b04325f8619e4e8fb38dfd94b8bd6fa90dd47ed5271175825d3306dd22738f7
font_02_sfnt_off0001870a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1870A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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