Malicious PDF — malware analysis report

Static analysis result for SHA-256 902cafae34a975c7…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 07:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d35a2ba5fa95dbb07108023a9643dfd3 SHA-1: f0044c9a793b7e0c69c72940895883db309b9705 SHA-256: 902cafae34a975c7c039961b818b9d0d59d00f2448c386af6b2d67a3314dc5f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true malicious destination and potentially engage in SEO poisoning.

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 http://prodottoitalia.eu/userfiles/files/kikezovelozatigeweraw.pdf In PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/78g1vquqb3hsgg6sigtsc509q8/pozop.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/xalalalavesupufitelivexuw.pdfIn PDF document text
    • http://mousike.it/img_ins/files/14938795058.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/nepedukepinosik.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nr7hp27mktmfs1atilhr3toqgn/92434609269.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/kigesovidajazaboxaju.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/47133228448.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/40702434330.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8e30540e---29854123623.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4ggc89dmia9ubtquv7djsdp8jf/35303504602.pdfIn PDF document text
    • http://sooclose.eu/upload/File/letisujimufixosor.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503155822942786.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4b1d21882d62e75e246f3ca0e86ceaf5/29684736094.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/ruwurabofazomo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6e33c44dfa13d30fab7fdc9b87efb857/mafijekemada.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/36426550357.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/63013473155.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d3bd4b7c---ziwalumerebixede.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/48143549950.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/vagilarerisujuram.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/20918737476.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/3385981846.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6613cf20a83922a260b047c9d7295f7a/jikikux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=solitaire+for+beginnersPDF 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_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 10604 bytes
SHA-256: 480a58123caa13ac0ef6485b06036aee0ec9c1b7efd25db646c961c62848e6bc
font_01_sfnt_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16864 bytes
SHA-256: 0131221ffee40ef15f84994740f97573fd85938f588938cf011548996d180a61