Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fcaa0d37c3ef8a…

MALICIOUS

PDF

93.7 KB Created: 2021-07-07 05:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cb038ad4d62aec439c51b5ddeefcf353 SHA-1: f01e659da131a5d6f246fdae601ce7239819cb10 SHA-256: e5fcaa0d37c3ef8a8e66718ad78dc6a8282edeb4599d6e32e3a805502e8a7c93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://lookkorea.net/userfiles/file/84883994499.pdf In PDF document text
    • http://amsaneeraus.fi/userfiles/files/5916925606.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f5e5fd9a98703bc9ff78957352eb3a09/32336424927.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf91a38f3---12114419009.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6530f22a17a4ccd2c6aef270acab3fd1/xigikoluzugof.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9fa2qhir0jerakec9a3e3tsq47/jedubinukitidipunad.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/kitosafaxotifulinavuw.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e28b4f52---xavufolezosadatu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c087778ffaf---nukepugaxovafaroda.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0352029bc90566cca67bae152c3d76c7/ruvezunizeribaxifazaxu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5c9d90593---torowolavesavusobak.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/60715128154.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093b30c5d0a2---lebukebaxirerinuxaw.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/j5oupjj8oelk7f0u02jikk0ae5/gemoredaxubifesakavixut.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bde02486ab83f3a4f8f0a78e3badcb19/givobegepaxategapob.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7ffba26d---66937054553.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a44e49060---nitutiwisewovozega.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ubofdrbmehu9kgtv18trpbug25/45889507332.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/roferukegunifefu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ons1tmo1h75n5g3476mra6t33c/36988913467.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/67734434251.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/85623766835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+meaning+of+bisexual+personPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 20036 bytes
SHA-256: 1116a7a2bb676092d3fcdf2d043e8ca906f92a0ac9de6e14f9c13f8e25e69d57
font_01_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 11012 bytes
SHA-256: 998360e8c299193a1c1dad93192d1fcbb804e62275ed0d1fc96a44a18bb48235
font_02_sfnt_off00013be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000153f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F4 16064 bytes
SHA-256: 313b4d1b1f982e25284d2f4e6caf7c0c7767db1f375da95b613bc7d89e59efd8

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