Malicious PDF — malware analysis report

Static analysis result for SHA-256 697a71afea677e9e…

MALICIOUS

PDF

70.5 KB Created: 2021-10-05 19:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5417d796a0c18d8197a867a3ae02c80 SHA-1: 6134d50f04248002f24cfaa2f2fed01a58a8b02c SHA-256: 697a71afea677e9e10ba78d071041a21b0771b2d1819ca1e058b89a8863919d5
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating an attempt to obscure the final malicious destination. The primary purpose appears to be directing users to potentially harmful content through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wxbeimei.cn/upload/ckimg/files/202109270317586810.pdf In PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/97918562452.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/651f3c32c3e7b981348045c2fbaf15ac/89663781038.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/5648270416.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/93061370904.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20211003_C6CE6483C7958021.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/nogawulaburage.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/85335982666.pdfIn PDF document text
    • http://banquat.com/userfiles/files/kileguvuxenusijuzivemes.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/tewezegujusogot.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c08173051e---nuvas.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/rikemegojuvopudidasibe.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0nf2nb4d38k3isds0fv1alvej4/37517493790.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/guxomuraza.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/riwaroroxis.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33498994404.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/nokiped.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/sixilosixu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2232b1fa---42838967488.pdfIn PDF document text
    • https://lasanisports.com/files/kuzulik.pdfIn PDF document text
    • http://bluebossa.pl/files/file/81836905781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gatsby+character+mapPDF 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_off0000b4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E4 15520 bytes
SHA-256: a8e3f16fd9693e693b8aaf7cfbbad2e57f0b4d3c0481118630eb8caaf219235b
font_01_sfnt_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 10572 bytes
SHA-256: 56beb5f0360e34a57701e2299530cf4f9ebc6432740b94c7a11d878a9b340901
font_02_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1