Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9c11a4da2b91aa…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 09:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e4ec99eb92d502c321195592054842e SHA-1: 597fe13603c21cdc4e11f1061001b2394a562f88 SHA-256: df9c11a4da2b91aa0f66cbe6eaecc8a90954c8f804812dcc3b04886673bffa9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the latter identifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://worthingtonpark101.com/userimages/32572620479.pdf In PDF document text
    • https://rzfmuhasebe.com/userfiles/file/baponiwubusudosikojaxapek.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/op838ebbqvngtm3dnsmovnoitc/54431102452.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a076097065f---kufubasomid.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/5516344345.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/kosagosodet.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jubiwonujelemaroxorav.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e585580c0---463275392.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/7681256945.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/87465980486.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160effc21ac32b---vatemusefalubiwukajiwi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d39e420494c5c0f91dd878d150e7b2e5/jazinux.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d08805f82a17ce24f13370e4815b6b5b/59264626332.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/62850598156.pdfIn PDF document text
    • http://billsky.ee/files/file/71892603850.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/juvqnulgs0jc566knasf8fr521/36638832487.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noduve.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3202e5dc45096384d392d79298a43255/50307127371.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/vopevurawarajujetab.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/66229813710.pdfIn PDF document text
    • https://manenshop.com/upload/files/56050988085.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/jupobitotax.pdfIn PDF document text
    • http://martonelektro.hu/files/file/29337754307.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/47990259381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sea+animals+coloring+worksheetsPDF 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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10932 bytes
SHA-256: c4c87baa81518dbf9d9aa3c040ea64d935e4dde34b2f1c79dc6168bb06ea7b95
font_02_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 17576 bytes
SHA-256: 75298551f1b1fe33ae64a342343104e7280475b22a1f15e5ba02ed47111dda60

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