Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff30a05eceacc46e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 05:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 026d021d3343e2ac37022213393fa2f3 SHA-1: b468c7eea54cd1efbb2dfe1b0fad102fe2ff86db SHA-256: ff30a05eceacc46e61d77f21201c809b94fbb1c42ca76b2adc20920240afb544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://marleenjansen.nl/images/uploadfiles/zefale.pdf In PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/86839152642.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/87482772149.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/fudilele.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/peduwitazegotedakibav.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3a6e4f08---54170129868.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/wobazididurojugelumot.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/96431991319.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/82944676591.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/numetuvosudire.pdfIn PDF document text
    • https://anandalaya.in/resources/file/pabifudawabusijomiz.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/92642251851.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/41b9059cd4c087f1aaed5982c5226feb/49497532546.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/49382451266.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/39693403607.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae40483266---25438052989.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/nijebagobozajuza.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/26274155670.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/tuvekajesumud.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/totasafukobufijofil.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/banumirogo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ff563a35---zunopavi.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/98518263573.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/43558403926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+font+for+phonePDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210906/16309121522343.pdfIn PDF document text
    • 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_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 17624 bytes
SHA-256: 8a4e915327aae9a1cab2c66677724312b2ba208dbe85465850815d2c7f59b6ea
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 10208 bytes
SHA-256: 83547933c69ec3932ad952abd6e65eff3cf2cf5ff8a8b9eaa88c0355d9128d73

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