Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d558fb30a655b0…

MALICIOUS

PDF

117.4 KB Created: 2021-09-08 06:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 917c778cf34b4904fb20037f66bb8d69 SHA-1: 0af05b98567948e6f4de2d5dcc50a58a54db33d0 SHA-256: 82d558fb30a655b07c342e7b3ce0ed73cf26cadf945df8f2ceb62e8f4db16e5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to external sites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://classicalgardenornaments.com/uplds/file/jirik.pdf In PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/14379360961.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/nanigajo.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5seg8enp08h1rardp3bm1nt2i7/18432258908.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/22416220183.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/bece0ca7e75f52d5aed662239c0b2ee5/wefolonobaxuz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a6f0c93d9---41552532516.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/216385810.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecceab1424---lalegodukepofugi.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/1322691890.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/jitagagekojifima.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vojozijixabofomoxoli.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43e82bd879952525259c45d210b596a1/ketoxaf.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3fa0d00bdf70caff0141e9316c7e16b5/78807877285.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1611a2f66dd7f3---46110210886.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/731678562.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/kimeponoxaletejetu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af7bf83f534---89975872113.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/78cecf6e283a6038693b72ad0cc420e4/62749803538.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ltkv6a305er6g25fsocg8nho7t/51259916429.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/jegakitafewikiwemegexonu.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/zunazidotemaloloworime.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba3f16f189---42714470363.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/zopidiguwafemiponujewoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=liturgia+triduum+paschalnego+pdfPDF 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_off0001629e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1629E 20232 bytes
SHA-256: 8a3e561c7119f496bfae536a7c847960964e74e3ee52a34791723d16d064cdda
font_01_sfnt_off000193c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193C3 11124 bytes
SHA-256: 7cd49949daac1e5a61752e33b14b2c5b91ddd2f1ffdaff4729780381685fa193
font_02_sfnt_off0001ad57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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