Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7d6d1b45576d12…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 08:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 320eac70395c438e3b6cc7eb7cfa0da8 SHA-1: 811493f9d02e957766130e5dce069517d92c28cf SHA-256: ad7d6d1b45576d124768040f276b3110b31e82756f82db57cd8cf95c99f732ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kursadowicz.pl/Upload/file/44376433070.pdf In PDF document text
    • http://blow-w124.com/js/upload/files/gugutu.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/35876493545.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/jumepeparufifotovudori.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/80735801221.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/rulamariwil.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wojojikifojoviba.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7f796ec6---lenobibuvovizelejenubaje.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/nagalorid.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/46463889124.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/tigenu.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/pisifawubibesolotega.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/334f2a726f4853dd0873d5d16197fe3a/98216790599.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/munigasesobowarezenek.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/wakulojevomemome.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/48nbmkpe58sjmt08k2rj3m0h87/7032031288.pdfIn PDF document text
    • https://cooperspick.com/files/xidip.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab3c77551---58567176101.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/monavidu.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/37378953615.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/16789270734.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/lorojavavipipulobupamasig.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/wasizerusovuwasale.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/81730713437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+sync+my+itunes+to+my+android+phonePDF 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_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 17620 bytes
SHA-256: 23c7eedb11aee8e48d0ead96352383ccf5ea1f10494dcfe33171feb4c78d67e4
font_01_sfnt_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13072 11024 bytes
SHA-256: b1c326da075aaa2856d02d280f114ba8572d76ed7d0b075dfe13f3a92f04ff7d

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