Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cca7ff0a9297cfd…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 05:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 129e98c416a991480a8ee87e2b96f07e SHA-1: 2dfbe471b534ed9f0af52bb9559e167daf2437d7 SHA-256: 9cca7ff0a9297cfd3611f0b55dd10d1268ac039c1de3031ed643f9038607a108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan PDF. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_URI heuristic further confirms the presence of external URLs, likely used to distribute further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://inwebjor.ru/uplcv?utm_term=dish+playmaker+dual+manual PDF link annotation
    • http://sellmysayarah.com/userfiles/files/74678253193.pdfIn PDF document text
    • http://gibisch.biz/files/files/7223027132.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/neraxolik.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cc6144dd---piwudun.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e7499ce343c8615d3cd0a19889491e1b/jixenopaxelolabuwituxibi.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/31161367550.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accfeaca661---lunuxiwix.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/81118580204.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/jaxapa.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/zenolovatimelodojufob.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf6841a78---18737039313.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0937723fb5720107763edceae2729922/sebaxexujufi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cqnqsj7tl7f60leldm85baco53/88736511439.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/josaxo.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a365017271f---tiwufok.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/furuxitikexibiwudisiwe.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a8dc23b94f9aa4196d7aa93b5c42a358/kuwuzofajajub.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/rebigononapuwexaxufakeg.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wovugutenetelifor.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/41394544432.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/fobanene.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/xagoxafafizanemigu.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/52648681493.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/jajozed.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-31/20210731034123286319.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/39dc85bbf7e706cbf8dc711261c460ca/54039964880.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_off0000c831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 18392 bytes
SHA-256: e1739c1e2bb4df00129595d3875d25e45bd4b794877c4d69e6790c967ef7e30f
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 10744 bytes
SHA-256: 5087beedc85356e9d6418cad7919b4ff6f8b6e147a3272e2cc10162e3575b326
font_02_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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