Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8d2d708ac3ff66…

MALICIOUS

PDF

101.8 KB Created: 2021-09-07 05:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6206ffd6b0bca472384ac4f659c4cac6 SHA-1: 3a7fe2b4bd954527ce09a29ce28f2824fbab78cf SHA-256: bc8d2d708ac3ff66dc9737aca75c4bb270b456b01352de8a1138d8abc74b17a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised or disposable domains, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://arslanemlak.com/E/file/75158942860.pdf In PDF document text
    • https://ms02bet.com/contents/files/78215918621.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/lixubisafatebesurilufo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeedf908e9---58909444608.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/catsia2eme882cgivg48133or2/9923543114.pdfIn PDF document text
    • https://birudongker.com/contents//files/sozazugesujogikuvu.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/pavewin.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106c5b49216e---35661338356.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/69062536421.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/sipuze.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7ed30955b---kokotorug.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fb1e81701a778c207afcb2a496ab6332/10270329685.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/87c069a4d6e7e04b06d8f3f0eafcf32c/rusizotimufiraso.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b0d4cdaf54c97917bf8e7393fb08a756/jonumifotenavupixevino.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/vebawefemazerezuke.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/unqssapojlscp26bi5k6jn4qv0/busajun.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/85894898705.pdfIn PDF document text
    • http://vipdiler.ru/files/file/70420205878.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce398bc9338---bebiwusurota.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/7430628923.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/55886627357.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bc39b9b4---nisekemopafaloxap.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/kobonizuxepawoboxinabomo.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/57208257951.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f641a36cdba4aa01512eb4ff38348ed6/85081182083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=circuit+de+carburation+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_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 10672 bytes
SHA-256: dbe0deebb0af8d4db421588306114f8234db4261fd9a0fadba4bf6af6a151717
font_01_sfnt_off00013b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15397 21164 bytes
SHA-256: c62d9bff7ab8224741a3a544085fb9dbeeb1d3aedfd221c8e9c7a16d7f7f746a

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