Malicious PDF — malware analysis report

Static analysis result for SHA-256 191395003fea0e38…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 22:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcea6574ac59454a7e8c7484f48b782c SHA-1: 7ba99121d4462178d19de429615e48d81e251246 SHA-256: 191395003fea0e388e587b6c89b890f7af6aaf4684f444d7aa375d8632cf16b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://longvu.vn/Images_upload/files/wuporajola.pdf In PDF document text
    • https://groupunsur3.com/contents//files/4409510030.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/18989110211.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/45691280474.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/megapa.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6195b042d---wowetewem.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cd74e5655d8279a79771053db962344e/23132602751.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/xoxagusedosoxuwijemi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8635058668---jikesazimigesujoxepudifak.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/kuduxutiletalagudubokaka.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/90527855447.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/vaniwodep.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kuzozibuxesojazaxikutenak.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d91ec600088deb5cbec7a4ae27177be1/zevegola.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/tiwufobipolebogutipuf.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a8923efbe13686fa3fabb1f2a0e3012e/40107532000.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cc05605296ad97fc88df46c07f285377/64030408867.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/86643314136.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sfgj34pjpvkdeq2p8ueifr329m/49464181540.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cd5c700983c19450d2b451734cc10885/94429272400.pdfIn PDF document text
    • https://tekartltd.com/upload/files/selefo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fej7vrm8uit1876llilshn4l88/mepimav.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/sueq90pfbpv7bo6i5cd8scgavp/96647639323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=order+of+operations+5th+grade+common+core+worksheetsPDF 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_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 11356 bytes
SHA-256: 91cd65588742236797e1690bfe9686b6554dae675726d01828a01c5f54700023
font_01_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 17452 bytes
SHA-256: a04a4dd9236a0d6b721893973681f3393edd7e531f49517ef0820fa94e49fa20
font_02_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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