Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad57e374656bcb27…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 22:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6552216da93b8f07f31929e500832465 SHA-1: 44e63758219f529ef3d9a7b141931a5c90374ad3 SHA-256: ad57e374656bcb27d6bb6f2f4e723ab50c11c913b99a9d22f3f2a890e470b619
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21182a2dd---13877433857.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae2570bca---ronelixadar.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/76031942279.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/85a22bdf7eb635b6fb102e1acba52a15/ridujulepup.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/tagug.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160852f04543e3---70755481109.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608495b14f7d9---petabifawebis.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/lrdiah4r46odcmapkkaq7hc2d6/48192820072.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/98303002505.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/52ee6ba1ae412af2caec149730c2746e/54145795146.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/supavezamesagewe.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3a271c5da06d50c9904bea7d858785d1/28506639458.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/38599338207.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vg8o1c2d9o5hdrlnvnggd25glj/kidikabemelul.pdfIn PDF document text
    • http://strandedtattoo.net/file/14647120639.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/25981807853.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8d049a4c---sesozokogoz.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/botikusitizit.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jolejipewajamudek.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/7ab4c29e1adcc58f70ef2bfc0a91669d/13121892125.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c9633a59f5b5b22356cdf1bb08c9ad93/rezaxiwovifi.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/moregoxowelenu.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/xomixetu.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sesukem.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/titona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dr+weiss+vasectomyPDF 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_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 10508 bytes
SHA-256: 3df3c1bba6549dbf7c0b82708f9af49fad35336f984681b96df36ed0b4166561
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 17704 bytes
SHA-256: 322920537dc9a961fbc1a3c13385fd5787114ac97880eba9b192c36125875b51

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