Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77d42e4077794d6…

MALICIOUS

PDF

73.4 KB Created: 2021-07-02 05:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a4aca4226e2c9ae33a97837dc11ac9e SHA-1: 141f16bfe09db847bdb6bf3b78f445b88b048e74 SHA-256: c77d42e4077794d62f9eea8b0cbbc7356f1214e77039dbdefeebe04cd8cccbb6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://4x4autok.hu/userfiles/files/sowepex.pdf In PDF document text
    • http://www.thaiboat.net/image/upload/File/68674009532.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb15e53956---88645099208.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/031db0e9ed95cef9e5f1a262643b0907/xugupapukuder.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/velagob.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c978773678c---4347472163.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d476a018c8a16825ebe5004688f3ffc3/96623280297.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051909090293.pdfIn PDF document text
    • http://poiskvod.ru/images/file/90485798408.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/25809671007.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b17cb167a9984dca63c6978e1250c95c/xegozobalavunomatakudaf.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b60a7dd7---jozogesonu.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/18836882334.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2bqjbidv85g0rp6o8imntjl9f7/72283524006.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/vijuga.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7c338bb5---xijori.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4566283f908abd9fb9236414497b4176/18777387001.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kkbrnskddgpvnk8jsapa79pjbc/28575202447.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/46930569360dbf0af626a6.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/38338858733.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/dukagax.pdfIn PDF document text
    • http://falerisztika.hu/tmp/67325272172.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217fae0b43---14091325542.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b25890dec93---97105383594.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/mixaburigisojoxaga.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/g2cbescqtgg33k7bu9hsg58000/39187044057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=causality+7+unblockedPDF 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_off0000bd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD51 10792 bytes
SHA-256: 81a4d04005d17e7a0fae1712b4c3baf5af1d353f9f834952ee1ef05ed5285d7b
font_01_sfnt_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 16196 bytes
SHA-256: 41c411e2559dd1f6261ff2b520eff18a24455fd4882759bd5d88463af119fe43
font_02_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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