Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a00dadb57de7d7…

MALICIOUS

PDF

71.0 KB Created: 2021-09-03 03:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 221f5ac2560c6d513e352ca61633503d SHA-1: d00994213c4ce34e800cb0e8575a77f43f17da6b SHA-256: a9a00dadb57de7d731ba122ef70365e3346c6bb288de58037282b06a25e9d8a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised or disposable hosting sites, likely intended to distribute further malicious content or phish users. The PDF structure itself does not contain readable text, but the heuristics indicate a malicious intent through its URL distribution patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d71a00e2e11a418d6a178d5e8963c6ea/93475110314.pdf In PDF document text
    • http://ehomeforeclosure.org/images/file/dunobelofikur.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/vazodefolivokuduletoponed.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/kolaponuvefev.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/66466189829.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/xefaxigasuzuguzegusu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1cadd221---25527244529.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/26553081048.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/14601250265.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/35521462946.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c765c5b2c5047da041f367cd421d044e/pegukezirako.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/13757755322.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/11237497511.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e58bcd93---babulatezowagogupe.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/68794856402.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/4843008503.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bd858a07d---78645755205.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/xefononifawafamulu.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/56605806141.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/57790558285.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/49aq0tgc07qh9heu92052qp34c/jipef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=historicismo+filosofia+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_off0000b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 16416 bytes
SHA-256: 904667f291f3d8cdf424c6e0333f07edf69b94f8856a3a927a899dd91fb0e6ed
font_01_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 10536 bytes
SHA-256: 524cb271f79ee7c535c3171883fa58b18a2c07401d2794a3aaba70705da18b14

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