Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfeb6c20c7b6718…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 19:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27744a08724bb4735a9c8b6b09f120c6 SHA-1: 86e317bc924ba3f95c554e16e08cd7c80e094aaf SHA-256: 0dfeb6c20c7b6718afbc32ebd9f3efcaddda445c6cdd771a3fea9027b90e8c58
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://songhandiban.com/uploadfile/file/2021082205544273499.pdf In PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fc6d707f---puwumapesatejivaguzagofex.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a51ca578792ca9c04a948b870ef941b/zoxuwuzakulaxikazunalop.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/44223812514.pdfIn PDF document text
    • http://showdoimovel.com/files/files/goremijemilel.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/lifafesugonazuzajag.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/titawajax.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/nesoditem.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/36274153852.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wapikowexidibek.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xipokimifezarebat.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qogg5bue7v2io2e96juogr90t0/26401914269.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6603225202.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/welaviligexavuzi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6253e23b19d630cde25d699ae9918482/99007293594.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/71322141069.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/xoxotusas.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7978f090069ee116257e071775b50342/nufagugewepevopoduje.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/sebipagafopezu.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/pokixuritakite.pdfIn PDF document text
    • http://shimoltd.ru/images/file/rubapujowasuzoxusugojilip.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc65321212---48265963109.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160887b9b1dfb9---saver.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbcb6e5db5---xikiza.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad16b04f578---71845337561.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/48893989575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ielts+band+score+explained+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_off0000bbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 15560 bytes
SHA-256: 6b2f8c20706ffc7806f8d1233611899c01515e508649df29e8616dde72460676
font_02_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 10808 bytes
SHA-256: d274c2a3731676e054c9fbd7e8610d5c4e3746b35e3df8ebbeb067f047d4fc0e

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