Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b9edd6f2e6b430…

MALICIOUS

PDF

89.6 KB Created: 2021-07-30 13:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ff292939dbc784d4059edc961f664aae SHA-1: 869ee4448453eb4a7398409b1f9586931351d51b SHA-256: 84b9edd6f2e6b430b57a337737163488117cad2de2e31887c9e9c770c5b11b59
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample was flagged by a machine learning classifier and ClamAV as malicious, with specific heuristics indicating it is a lure for multi-factor authentication or one-time code harvesting. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to compromised CMS upload directories, suggests a phishing or credential harvesting attempt. No scripts were extracted, but the overall pattern points to a phishing lure designed to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://apsencollege.org/test/fckeditor/file/14927093219.pdf In PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/gobolesise.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/qebs0q6bukqstj17tk98omqjsf/19185992447.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607234b9d5aa3---meduxatiwemipokejimavo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e497733757eaa28491392ed45fa40d47/51192362648.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/xufesebobub.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/jibanotu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aeee47759---36389528727.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/maludarotufirezikakuwixi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e3e258da38f0e99b191bddf1ab4e7542/86463442804.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e31d9bd7bb93418de1935685bf3abe7a/48578836792.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/gujijemonujimegivobepo.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/26472434566.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a107a0e527b---52164052794.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1l8dmi00bcs4ao6c6v1fpun501/96153054804.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/xiwuzuwafunitiwunu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b7bdcb563---lopoxasugetutajimejod.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2df134a55e---75968149106.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160da80337079c---55667508340.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee303b52a---ramejurojuxifono.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20d4989f50---novemukekasinajanafoja.pdfIn PDF document text
    • https://industriameccanica.it/file/53862069514.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/fesomakobavi.pdfIn PDF document text
    • http://banquat.com/userfiles/files/59748843350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=manual+codigos+de+control+universal+steren+rm+8PDF 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_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 1864 bytes
SHA-256: 3ae51fd610f93fda52280d3587598879eb616076db170d3bcf8e16b1a7bbf2ef
font_02_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 11080 bytes
SHA-256: fb496089ad957773cbf1292fe87db9470b946acbb08827191c0dcb558def928f
font_03_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 17268 bytes
SHA-256: b2a130bc306d34c89a3e4ac8ed8ddf931e45a816df8bb9878bbe993a5610801c

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