Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ef88e1a827ea5a…

MALICIOUS

PDF

84.6 KB Created: 2021-07-04 20:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 212e5528b951893b6588097f1e09d85a SHA-1: e2e151d96df390cc9e500747e2e972e9710dd9b5 SHA-256: f2ef88e1a827ea5aeb7adc70e08d5fe658793566dfbf4b16247ca3ea298aacaa
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The embedded URLs suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mbcasc.net/imgs/file/kexetoguxuga.pdf In PDF document text
    • https://argumentua.com/i/file/47558965178.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/62860408217.pdfIn PDF document text
    • http://myphamasia.net/upload/files/vekapifaniwaxar.pdfIn PDF document text
    • https://nexusmediation.nl/files/88627214891.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/905qnfu2nnmc8c0e090ljle06r/76684247678.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/94085503244.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/96382682382.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4369a3355---55636993309.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5c633e3d---18317755523.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///72033080796.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7cf8ecd0cbecc5eb5fd9a91d3b53e276/32912754653.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/21902577372.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/sawonomiguwujum.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/figixenanub.pdfIn PDF document text
    • https://melz-feu.ru/upload/31008995545.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/zojurufinusabotoxuzebiv.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/139487061.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c229775bd---febuwu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5430ba4861---disufi.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/fevelazip.pdfIn PDF document text
    • http://garderoba.sk/images/_file/16266064726.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/64361743335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=integrating+ict+in+teaching+and+learningPDF 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_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 10312 bytes
SHA-256: 0a11f6755eceadb9718cd7f846f8544a780f6f1be7d0fd0a4e26d1d0fdb06dce
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 17112 bytes
SHA-256: a92851e3e04c7283d947bf49d3fe56af1b5a4f6c878a8016543b31e2f34d61e3
font_02_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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