Malicious PDF — malware analysis report

Static analysis result for SHA-256 778c6932e3eae627…

MALICIOUS

PDF

71.3 KB Created: 2021-09-03 23:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72164d44b121b69cbd634e9915e15e5a SHA-1: 5f71fbe12a5814cb6ae87e25f420ca7bbad3534d SHA-256: 778c6932e3eae6275de323b0739552c529c1b7aba78d684eda1df4f91b442399
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://shsclassof1970.org/clients/872719/File/67825155514.pdf In PDF document text
    • http://hanhthien.net/uploads/file/bajilolenevukuxipado.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/89tp56v73a76ckd9j7e51a4deu/kukojebademonu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fezoputokexowa.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/96961346918.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc5209987---vugezo.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/92ff21e550f0e9f7d317083339030e66/xifenimibiziloman.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609520480b9ca---merotosaseruvovonaja.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/tmh3cvqidnc84kiqg3khgs4klb/64820609015.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/75778555067.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b49a1e022c---65870015670.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/63457092903.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/demosewapusesunemikunoxap.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/46130082731.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u6s5vt2aas0grp5mjb4ipa2926/lozifemetig.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///20954138536.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/67769678150.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/selezitu.pdfIn PDF document text
    • http://builderall.info/userfiles/file/84252247836.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/19448142533.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/22731268998.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/5448646416.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25932482033.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/olajedilaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=132+kv+substation+equipment+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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 11304 bytes
SHA-256: 7ef29d6aceaa4076b8f79caac826187dc19a3dad7f8348a2b99d27a2a40d356b
font_01_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 15652 bytes
SHA-256: df334af8b9f402b80af44e1cfbc71a0350ec2288488ba2c15aa36b05304db883
font_02_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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