Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bd27a45afb50ad…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 19:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 415aa7346f27191043e600098e372d45 SHA-1: bf3651a34b06ba1a7a1ef7ff49f4313d9b3a3038 SHA-256: c6bd27a45afb50adb1974aadd3c5dc0f6e65283d1df26afb18ed623a8284ff26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sun-green.eu/ckfinder/userfiles/files/rakimekejutasi.pdf In PDF document text
    • http://sushibelovo.ru/files/91983065091.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/wekigowalo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd588b752---68499299005.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/nexutakupowex.pdfIn PDF document text
    • http://spakimthi.com/upload/files/tawapoxi.pdfIn PDF document text
    • https://penzion-palice.cz/content/bemavulevisexegop.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/65681113958.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/duxijori.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/25792166693.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/58846227952.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/27349230352.pdfIn PDF document text
    • http://wajl.net/img/file/202191018842.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/soneb.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/fakugaxoso.pdfIn PDF document text
    • https://superpart.com/files/33456027075.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/daridoxo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ea0u54rkjd09j914klfro2rs6q/96660886996.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507a1c225b---dolakalifo.pdfIn PDF document text
    • https://yodobashi-church.com/41388596288.pdfIn PDF document text
    • https://digireg.lu/upload/32021312258.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/faf76eb6583a2cbe7ab5983bb5185a63/48497480979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=redmi+note+8+new+updatePDF 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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 18356 bytes
SHA-256: f90b7c1efb4b6e57b7539af32ca051b1457459290833701222bfd088d004dcdc
font_01_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 10676 bytes
SHA-256: 6510aa806f4b4c7889a1e47a92dbfecce613bbbf75275d44ffb52c354f18fb5c
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1