Malicious PDF — malware analysis report

Static analysis result for SHA-256 f888f4f012404bcc…

MALICIOUS

PDF

93.1 KB Created: 2021-06-29 20:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 08f203550b7acdfa3c561fc61f789d0b SHA-1: f6f1b9668db5bf087a93462699866a9fc97b0a69 SHA-256: f888f4f012404bccb048d280e61267a60593388df0f1e44e80491a8e8723a0d1
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers. It contains numerous links to external resources, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or redirection scheme. The PDF's structure and embedded links indicate it's intended to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://oncallanatomist.org/ckfinder/userfiles/files/13495565109.pdf In PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/dezufebogevurizomesuk.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d287fd3a9fa---27262388851.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/vatukagaf.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/96576362059.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a65a38d00440d4723424876f11278e01/71001380373.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/vusulef.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b8f87221---bavefimamigawobe.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/77612734445.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/noxizebasituzobatup.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/mowuvajuseratobobumem.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/naq7timn4vvag0hibb0fctm2fk/dexuwat.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd82fa610b---wuzapaxudakavijevixoter.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1cfcfb865b241d8c54e6d43aa7f78874/lisiruvowu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096043e172fa---32991295915.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20216782437.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608057b822b68---tuzesiraxibobaz.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dcde66e0d---monasipuxamefovasolil.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/gubazanivulerufo.pdfIn PDF document text
    • https://bonacorsi.it/file/96747116835.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/domufoxukinixoguk.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/71454359600.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/legilasotazom.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/vixaminakufomujovos.pdfIn PDF document text
    • http://absigorta.com/E/file/garibipovunekagi.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5ada0eee6ce4320d55841a0d3b223aab/fazesaxifotibezudunix.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9801046fbd497ee10a7db86c1294cd5a/97214641490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sat+maths+questions+and+answers+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_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 17204 bytes
SHA-256: cd91903afd29b41485ebfd633fbc73a0800da526df625ba737f15cf739ec9cd4
font_01_sfnt_off0001354b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D62 11124 bytes
SHA-256: ebfb1713c91d267c7e84b43b74d2ca90a8b6a12888efe7a200602797788ffdb8

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