Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b270d62217193a9…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 14:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 419df0bdfe76ddd4d8a70c5f48b6cada SHA-1: ecf25ffc5d74cb14b658501ffb2e2c8b5f019c15 SHA-256: 8b270d62217193a9bf48188bb03c596bac0f35447d8a18a34bf61f75d8a45b11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://smidgel.ru/uplcv?utm_term=agricultural+development+in+africa+pdf PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a37151ef81f---dujakox.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/39565823864.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/gukitamov.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a950f171e2f---malososibigowax.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/83059729554.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/77133170714.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/db6370dcdddbd0589b4a2fa47ccc069e/53246798761.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814193f1f13---57103613961.pdfIn PDF document text
    • http://lulanjina.net/upload/files/85738894969.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/47970131170.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/fojovogo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cago6mddje535ud50iaarjknt5/kujukabojudiku.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/33894768035.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161296ec8a51b3---lonadonelu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa161bca6e2---taruwugopoluvupumaten.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062922244873499.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/if2lnua6o648lc85lqp40vejkn/repukazo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/dc7d795921cab10349789df10d859c0f/19353880912.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/57070506749.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/40489172329.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/75660894278.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/44957283269.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3a4ed9bc---femujubebumox.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_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 10940 bytes
SHA-256: 3466f36629516eece33a82eeaff57a26fde9b9fab3016f4ce3dbb90509062ed4
font_01_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 16664 bytes
SHA-256: 3c16715652782a3da8299da1a9f85e3053c16635403dbec67775493cc9199fe2
font_02_sfnt_off00014300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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