Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b3ee8ee137221b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 23:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a113ddb08deb2156b3ee121694c3717 SHA-1: 914625ff996038a8d77aba028f296fdde7012699 SHA-256: c2b3ee8ee137221b43916aa296643b28e22be7693ae98216aec127404a690af8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://safe-international.com/userfiles/file/31746996727.pdf In PDF document text
    • https://aurorabersinar2.com/contents/files/notabozibe.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faf9fa2783---64072188134.pdfIn PDF document text
    • http://dsagco.com/Upload/file/bofonuxisodav.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/91879766672.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/mabok.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///2113704983.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/junapogetoxosola.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614057c932a09---jiropikawa.pdfIn PDF document text
    • https://hse.tw/upload/file/rogowuxafixodiwufugola.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/burujada.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/pozegegozelaporud.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/49203173716.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/grmm17k6m240qgul2gai11n2cg/lufimosalana.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210906152130.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/62528739438.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/49030670163.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/perunajenebepoxogav.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jegabime.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/xalox.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/pufufetepolal.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d2c281ec0781044b87ace1ea2342a922/79520003723.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/petufebak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=aja+chat+app+download+apkPDF 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_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16524 bytes
SHA-256: 9817b58d1288fa8489b9c20972f4d6c86143e1c96016f15a77c1b2f74657729e
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 10408 bytes
SHA-256: d9eb2d365d12f47d139759e34b4117b733c82d1b90acd667f2611f764beadc12