Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8de990d60b4f3f…

MALICIOUS

PDF

80.9 KB Created: 2021-07-24 01:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c4c2312dd6d3264fbd21edbdda00fa0 SHA-1: 44d48e270bf354a2b54acb030966ffcbe90a71c3 SHA-256: dd8de990d60b4f3f2c271fa99decc30017ccc28bf2b5e7a8d1a60c140cac7142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081fae6edf62---13460376709.pdf In PDF document text
    • http://residencecarlofelice.com/userfiles/files/91685729016.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070817431fab---61440934621.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b54ecb5d2c05d0c45877383368e0ae3b/14631824860.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/h1iub9ktvvu6f0hfcm3rfhp8d5/14321231817.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/18980076113.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1035050aaf---53701709254.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/bigovosusexa.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/jalafujikakapiku.pdfIn PDF document text
    • https://kham.vn/userfiles/file/78428584746.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/dubemalitikuzokiret.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/gokinapiluvudaberodinese.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/wekakagoketovutiwavipoto.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/5018290931.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607554b56bcba---xakefin.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/bujujawa.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/47483873610.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3526r1c5qchkmr21orpv99uprs/ribafadazidisugubu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/10ac846c96f8eb1d2271babec13998a7/wasogukamojed.pdfIn PDF document text
    • https://inks.bg/userfiles/file/3809478399.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/naxebotovojowaliwavag.pdfIn PDF document text
    • http://ave-france.com/pics/files/25474908705.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/97343718643.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/zetafutobogokokefemotiwit.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/29678097778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=converter+metros+quadrados+hectaresPDF 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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 10840 bytes
SHA-256: 58d968d0ad69730a5c0397c15087a3a018385735ca9fb5c1055c2a385fadf756
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 19236 bytes
SHA-256: 9d7d66335951e7dc435ad5860487d12ed05d1679e837465079dd64ab93611b33

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