Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8bba6508ce8e56…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 06:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8c6b57c25b908105fdeac9550a50dd1b SHA-1: 11839640b4608a28389cd6bd085f95a387c206cc SHA-256: 0a8bba6508ce8e56f6cec3d48d3c1375905a200983f36cf68f0aa9708a4d2f39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=naruto+shippuden+senki+beta+mod+apk+1.19 PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd56731a412---lowelutibegibizor.pdfIn PDF document text
    • http://usagimatur.com/files/others/zikoluxuwiwum.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1a59a0667c80c965229f67f2be0a1d6c/jisatopuxi.pdfIn PDF document text
    • http://someteme.com/archivos/_20210628090317.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16116de80d6c8f---tarufowirusefalani.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/e9seecpibjgh9j07ok3o29umnv/roruxabunuzemunutinose.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57732942b3---72210753023.pdfIn PDF document text
    • http://efrex.cz/files/file/36413173356.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/94798267143.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b2cd16d70b064684ff7250bed715e773/93725524761.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/4179635666.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ef34a01aa851befa4f09defafabb9734/tenafowuzoxox.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/87324387002.pdfIn PDF document text
    • http://kasargod.net/uploads/file/30027871149.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/41641424577.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/90995854842.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kewukaziz.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/adf23bdaa295691f1eadafe9af347673/32427384569.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/jukifaja.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/24679646770.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2281e3b79e0cb501158ffa66d18c5ee/kipanibosinimiboza.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1a04fc4c259e44dd1ecfbd976919878/5613899979.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cabd3ab18---runugiguleduvilefibet.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd61fc41027---vebaruwewivexapob.pdfIn PDF document text
    • 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
font_00_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 11204 bytes
SHA-256: bda4617417f2fb60d20e82dc1c8633b798875b998537b509356d2f1780cbbf80
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 17296 bytes
SHA-256: 75331326299d29e6119e93afd11a314367cbdfbb4d0b63db418b799a363412f6
font_02_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 2408 bytes
SHA-256: 930d102a66b6cf921cd5c69a8c371ce67215ba5d6ce0d895954fa2b8f78a369a
font_03_sfnt_off00014214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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