Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68caa2b549e12e7…

MALICIOUS

PDF

65.1 KB Created: 2021-09-19 16:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a458670a8074743848498c9fbd79fa61 SHA-1: cd0a90f13bd678cde128c376e50b4a70429481cc SHA-256: b68caa2b549e12e708b5299ba500d46ae3e6a2d24f74e982ab5e63396cdea6df
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, with several heuristics indicating a link farm hosted on compromised or disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier output strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links points towards a redirection to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9370

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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 https://allytemp.ru/uplcv?utm_term=simcity+cheats+for+android PDF link annotation
    • http://ipea.kr/userData/board/file/77474138201.pdfIn PDF document text
    • http://snsi.jp/image/news_file/lomeverorejiwub.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109060030138893.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613169012066e---34165778474.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/39700701115.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142a8eb775e4---60691423519.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/pumuvabojukonutegopumox.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/52515339570.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mco1up2pqt89678h3ut0u3ia9n/904030897.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/pawos.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/51d7398b2b5486f43b96f3ffe973671b/12835892483.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/mijanaribimekilosimipez.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/110mf0cba5tff5359uhb145i5u/digusifepeluzarofotifatid.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/30518936078.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/waxoluwiliwiligawupozir.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/90236061286.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/jedorekapilenul.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/97362351564.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fb8ba2661a83d337a758c79c0d0184e0/75866781054.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1D 10884 bytes
SHA-256: d588bd3aff48568d699a0027ccee634ce0b75e0059ef45c34a9d050f00c3ac62
font_01_sfnt_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 17076 bytes
SHA-256: baa79eb0e78b9b719fb53ce3b3e6f2989d26ddd8a926edb33e5c0e5230374061

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