Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9ac3325345d949…

MALICIOUS

PDF

103.5 KB Created: 2021-09-03 23:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b19ada155f5c67f2ca5a7f6988051ef3 SHA-1: 9bd89df4db1b5b4d5a5cb5cb32b0a996efe7e73d SHA-256: 9e9ac3325345d9495af7acdd38da8c339ce6b4dcfdeeb7e5bb3188c44bc6cbb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests an intent to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ankurgroups.com/userfiles/file/36079916379.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608174b6a25e9---lataje.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/xozufakiruni.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622295699.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44e6ee8b5---43789615572.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/78800261575.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/besizonarunapuparule.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/85995837669.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/vovowetaxovoxidefug.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/tapafasokebivaguja.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/51307430451.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/39650061687.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971f876227d---banekufexaguradeb.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/d5p93u5moc2cogcf73kvhp3lfa/18381366021.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/tasoromujifapovobanex.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c960aabb2---rawafezipusi.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/89569621097.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/narnncdrnu8585ljct6bmslv53/fulilesunum.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/29871137748.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/netuveruw.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/penawubuwijezewexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=flintlock+mechanism+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_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 10856 bytes
SHA-256: f893d37bd34a3c84580a69ba0519e234f39903a3ef7f2802155a782e4eb2623c
font_02_sfnt_off00015a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A94 20220 bytes
SHA-256: 1a37b98dc5cf9b55459071eaa9839664a7b185c8d24bb7b59b9a2c3bc22c1c25