Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd38d0fd2e097e9…

MALICIOUS

PDF

93.2 KB Created: 2021-07-06 15:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96a527c9767a7f8bff4b43ea5d6cecea SHA-1: ad07b0b77db3b72a1504fa53bff6b261a6cde0d8 SHA-256: 4bd38d0fd2e097e976e9f36bc682de65b5f8c69e291412274c4c12dec048d1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm or redirection mechanism to phishing or malware sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious links across disposable hosting. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9782

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://catamma.ru/uplcv?utm_term=how+to+say+book+in+spanish PDF link annotation
    • http://skomi.ru/img/files/file/15977047409.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/10657617052.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kajowo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bf559cebf---97134045801.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/944d5f749a39871040ba873956ab001a/6360427575.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/16179167230.pdfIn PDF document text
    • https://arerp.kr/data/file///6402372076.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6db5c59738---gopegatobemojugirimodut.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414df624e7---14593128611.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/c8qpbd9otetb0vha74obgcofjk/budurijutemuvetitapate.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/12431522722.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160951d1f8368e---fovewijimuzo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/39417754304.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa38a6d511---87273193683.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/15958255437.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/jisokekusabivufap.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/56836123527.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160749e8950aa3---62815959913.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/228500418.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/s12a1us8abbgl45546icq9vm3v/sunozogunefogud.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/sifuxesupatabojifirize.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b465ccb6e36---57238135509.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/migumuvubig.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/tezevuxirametinenak.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af907104292---78606041489.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/42791363129.pdfIn PDF document text
    • 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_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 10492 bytes
SHA-256: 1a7cf66de8a992eaa39a0ee41ed9933b33b174650c9513d63297234396838640
font_01_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 18416 bytes
SHA-256: abd2b9104413babc5f9ab0a606873ac496e3d8252169934f03ab1359b697674c
font_02_sfnt_off00014fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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