Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b49392f08a9875…

MALICIOUS

PDF

99.5 KB Created: 2021-07-01 12:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 116280da91ae5ca24c3a0211b0dbc375 SHA-1: 4f07bcf43628d066a2fbe816ad9ff8582e5f26f9 SHA-256: 00b49392f08a987573ca42d67fc51d2927e9c20c4278d1961293514768e37e76
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/f4639fnsuuh6qf4dj5mi9l62mf/19298323553.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f3ddacda---jujuxonubipizizi.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/0abf94f974e26f9d904803e599c3b5e0/27548902877.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/wawudamakutopapevuxuj.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fcab296c4f05476c5885cc91132dfe98/sevow.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079004c83438---29111098123.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/441e823228e88d8d7f121e09d6c37578/lufofi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f0005f594---32115328137.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/zubawupu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/73459369593.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/ridazomoxesupimat.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5a20c633c77700272094df6aeba76709/86868620654.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/bisizubumativasu.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/towipikemigabenipipi.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/wibep.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cd9b46e7be2c21c49b1f6dcf989e25d2/fipatezasenapoxolamugu.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/jufigikexofafolima.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e23ec681---dodatik.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf2aa0de8---7871759241.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a05887730c---rodotidakiwezofi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8374e5c40---82394634155.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2234ae0d5bd5e2ea5cea9c25751c7087/sepuwijuvegasava.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c897d2323c6---45437509649.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b2b07688dea6c6d19851ef2f5c5ac5a8/68696846374.pdfIn PDF document text
    • https://efnnma.org/files/file/sojumi.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/xomatimomipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+school+story+questions+and+answersPDF 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_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 18484 bytes
SHA-256: 33c4cd552497f56ded3c604098455e5d49c1e0fa858da440868c9eff5dae6f06
font_01_sfnt_off00014f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674C 10876 bytes
SHA-256: e82566085611e0ee4033dabd2875d48c02db14e5a4ed08b3b8c62244e506d9d0