Malicious PDF — malware analysis report

Static analysis result for SHA-256 773e255e61612d78…

MALICIOUS

PDF

96.5 KB Created: 2021-09-06 19:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7016b9593fedd8edbe0957c51d40d3c2 SHA-1: 328486bfc3b96f404ad0c4cfcd9588c824597fde SHA-256: 773e255e61612d781c80b2dd25ab1c92875036c7185f31c8445ce13158134857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. One prominent link is disguised as a search result for 'soda pdf desktop 11 download', indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://ymvii.com/admin/upload/files/xadopuvewaxarabuduze.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/dc35d7d185bd290fd036bba7be25d51e/funefivarutifa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97fedde160---vezuwitizeviguzavesolim.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/papikojosapuwenovafovez.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/godidunoriwokuzijotej.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/50ea7jogt0cq6urpc5jahjus27/46263153772.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/galuraliwotizidasowariziz.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/lasitilegufarataxewugagu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/135b711ceb9cbb8dc0f654fdcaca7e7c/27401550717.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7f4bc045d02a27e41941c9fd1691da6b/6580142010.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/defawijaduw.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/selurosigiwovavolumafe.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1161646395---pader.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/ginaweputopi.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xigajafojimazuza.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/61438908150.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111263bafa17---popenas.pdfIn PDF document text
    • http://itfind.ru/uploads/file/65673981836.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3377886d355be96c739a3c33ae1925c7/ribul.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/85126841635.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/pakelubov.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/tal30skivf5g5mjc60s0dj95v6/kobolakuzametosag.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611af07de93d5---demaxinoberu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7892b2f63f5e6b97b834d9f2c5b7b335/jefokojokam.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/cb94155b47a09540ad086bf373295944/wavepemumebarot.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/38407907848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=soda+pdf+desktop+11+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013d8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D8E 18664 bytes
SHA-256: 889bc38c6bdf2d0365bf76316ddb9f130ece50fddf0030f16fc2fa9b582cedea
font_00_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 19264 bytes
SHA-256: f6353f20c5e64ee2434cfee3fc5b7deddccc78258b35b4634a14570feb8a807d
font_01_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 10604 bytes
SHA-256: 7d5f5938c1ef6aeea389fe8d9f0eef2264b8a5b643e833696875660be87c261b
font_03_sfnt_off00015b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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