Malicious PDF — malware analysis report

Static analysis result for SHA-256 182082bae9f5140f…

MALICIOUS

PDF

70.2 KB Created: 2021-10-09 23:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2833bebdcf89dcb1a71ed6bcfcaa91cc SHA-1: bdc1ab305e21e5d8e20b3700c5d8e214ab6e69c5 SHA-256: 182082bae9f5140f5d9fa1e258f6b4e87f7af7a58d98ba67373e105411c9c31a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://yesilderecine.com/admin/editor_resim/file/66553166512.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lnn7so60iu7squnkijjcsvtqat/43551550526.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/xaludisetaluf.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/suxalipevalimifaj.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/fiwonoxagukizojokirivun.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ziwopu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140524d1c68a---vuruvurufugesajaxafisemem.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/901343384536251e9c41bddb3ca16da6.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dc6437373d618ae03953d6504c544da8/73428359236.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/gakokazaligefaforisof.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kadopujesitofibo.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/99433150047.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/dedeme.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/63042768596.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/25533583748.pdfIn PDF document text
    • http://humanlitech.com/files/files/35981402143.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/geloxivusirome.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/30663041895.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4ph3a3fi3asnksce7rsrkj46e/zanogubiwevibosaz.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/56076940694.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/75144442005.pdfIn PDF document text
    • https://indreninepal.org/userfiles/file/23299280632.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/rigutenalefawemenaligox.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/zazemofozamitibofimu.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/15147744908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=personal+trainer+salaryPDF 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_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 10216 bytes
SHA-256: e4d9ad0aada190fbd577205de2405d100b951df574f8286a6801740135369418
font_01_sfnt_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 15516 bytes
SHA-256: f5cb6888821849aae656b1232f7a83fc11d51d197eb67f737b34282715ab22e3
font_02_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1