Malicious PDF — malware analysis report

Static analysis result for SHA-256 30befcb29cab9494…

MALICIOUS

PDF

91.2 KB Created: 2021-07-24 15:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9ce441ec78c66b5f9fee983756bdd920 SHA-1: 996df60de86444f7f746ca739b084eec493b2f00 SHA-256: 30befcb29cab9494fb48fd1ca6c3c374c13e2b895f11101113a37d30d04f4fdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of these links suggests an attempt to lure users into downloading additional payloads or visiting malicious sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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 https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4c1f23acf---98048138869.pdf In PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/81219665400.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608399021e28e---80654711907.pdfIn PDF document text
    • https://andana.us/files/files/momuzupamuwo.pdfIn PDF document text
    • https://camelcarpet.org/d/files/jusukon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74397e387d---37195584114.pdfIn PDF document text
    • https://arerp.kr/data/file///97931807243.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f4e104a2b40224f5ef11f32025d58bc0/nitajidibel.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/xejufegopazofigup.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ob7p17cm84ucafgdrla4da2c32/gabisifupog.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da361e707---vixijokofetazoguk.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7ee58a1467eb3871b0e9785601f70617/musuxapusewikezijujomalof.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/9apdepgrdp07g2nah2dcjci1us/21471287268.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/boxixopakopemiwumivasawa.pdfIn PDF document text
    • https://pichsas.com/file/webupigolebanagawisub.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rh62qrd2assp24thliovah9t8r/50578712784.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/90382178638.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/76961249437.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f04b8205---nonifajugomod.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0de43d89---8037593322.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210609030220.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/boviwutuz.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a13614f54---fipebumobinajitidapexusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+fix+a+squeaky+dryerPDF 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_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 16376 bytes
SHA-256: e9dec4a819990b9d34cb1a804b80b6912387cf2018b0a57b81842862a495dcb7
font_01_sfnt_off00012dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 10728 bytes
SHA-256: 7281ec99b590c09f9a9a6bfda5d2b9f15006d5d528fa2174306c5f72c77b8c24

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