Malicious PDF — malware analysis report

Static analysis result for SHA-256 9130afd98bbb391e…

MALICIOUS

PDF

91.1 KB Created: 2021-09-14 12:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b47c936be891b54707dd762890fd7e53 SHA-1: 77fd6ff1c73b3de908db309d85c836ea99cbba19 SHA-256: 9130afd98bbb391eb660edb41a23cedde1d9158b23b436c094ec8484ad1a0fb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://directorvincentchow.com/fck_filemanager_upload/file/poderibagafepa.pdf In PDF document text
    • https://jxlmedu.com/file/files/20210906_020428.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/nomapilagexuba.pdfIn PDF document text
    • http://eko-uklid.com/files/file/12751662102.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/lepagusafegajunasosisev.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/85ee0f43c5295bbc6fd09454b760d357/maxatokupesegamiragazexo.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/bafufojurowesotibotikut.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360dd7bad20---6690131613.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161340e14a2917---jesunufatuwagofiful.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/47833782741.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/ragiwerekikiriluvewosum.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/pesinudokosivulevuni.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/oeth22q2010645m0i301og0dug/wipepupefitadoropokix.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/zawef.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/49755417212.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/77786022485.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210906135850.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/64362766896.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/85602517850.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fefeb8247279f1c53c54bc9f997fa493/wowebetexarezirexepax.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/sevifimodapoluxerimase.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/86913658374.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/rewaduripedavekilumozi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b181ac631b562fbc4fbd3e23e14699e5/96335946369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+walking+dead+world+beyond+cuevana+3PDF 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_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 18076 bytes
SHA-256: 3b3b6b2a0134141f506c452c0a6ea5689d59a7c565d24fb7e0a1d5ea7bc56e37
font_01_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 11116 bytes
SHA-256: af1ea1e8ab114c462b8b5e9219abb43520e7198dd941fb6921a200e1100d0a7e
font_02_sfnt_off000146c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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