Malicious PDF — malware analysis report

Static analysis result for SHA-256 8396550bcc799fb0…

MALICIOUS

PDF

74.3 KB Created: 2021-09-01 08:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bafafa3ebb22453e0fe77cde8ad8662b SHA-1: 649fe5fdc4cef9291286568f52162eec38370b3e SHA-256: 8396550bcc799fb0de84bb48ec6a7a0cee28c87e329de0e199fbdb2d946ec0e1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. The primary attack pattern involves luring users to external sites via malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://producedepot.us/userfiles/files/dawatebupuxoru.pdf In PDF document text
    • http://esipro.lu/userfiles/file/45231355707.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rabagu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da99ac32fa0---nevekefulekifeg.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d0b05b533fb5f750bfa2998a7dcdc882/wuzanejosebefamogaf.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/tqrf80fjlj36nu812bkbrid2j4/58866469760.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/xifodofedasumin.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add353bdc9d---fabumalopuxudatijewu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jlhpmjq2j4botjtfa9bolht6d4/sezakijobifed.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/40784334996.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6db5deee31---gofitawavonezunomade.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/verekag.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/nabemibonigosorafuvo.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/49273018454.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f35b2326e73---zukezutezukejavatu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c0a97c4e---50268551963.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f093c384ac---zogijerupemudevupok.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/49720977464.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16091463c6c1af---90931746664.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc7d27461a---belinoxasujonekusesodek.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/2i4i595d16t8qjijvi5i4fmjim/86130817831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=social+institutions+in+educationPDF 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_off0000c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F3 10440 bytes
SHA-256: 9cce704fc3dbddb0606663ea851436b715df1aed706063e98a3b280d9b3fc38a
font_01_sfnt_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 16756 bytes
SHA-256: a88006e203f52c2424470cda4ebc39f5574d229bf9954ffae890d646607c6e93
font_02_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.