Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b040b581c126a1c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-27 21:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 80e4935725917befd568c0f049eed85a SHA-1: 8669e2179765b4bc951f075c5aa53a64fdbb439a SHA-256: 1b040b581c126a1c59c3ba9f3e572b725d37804da2dc550eea5d8415cd5646b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ya-ke.cn/admin/upload/laguwekagef.pdf In PDF document text
    • http://svatba-emi.com/uploads/pages/files/darejodigiw.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615114f8829b9---pujasezupijobedezo.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/7781625034.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/4120958367.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b62d881925---43711578349.pdfIn PDF document text
    • https://rippa.pt/files/file/62865431314.pdfIn PDF document text
    • https://andhimazhai.com/images/files/74803898559.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/58021647121.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/663ba7f037ef04afbd4bb1e362df0249/besuxexalaweduxe.pdfIn PDF document text
    • http://beiks.info/public/file/60525038315.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/kepis.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/30630613618.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149659e3ddc8---sotedanurevifovo.pdfIn PDF document text
    • http://wernitznigg.at/files/34033747409.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/37971627627.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/62390585287.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/60180936302.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/mesogibavigaze.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/butunusiga.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b0575914460c9e5764c6ae9d9d37757d/nimilitagavetotijekotuju.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/dobuxazosuweranuzenod.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/26809721984.pdfIn PDF document text
    • http://kasand.com/userfiles/97824523131.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1084bptqoghcgsa2c9ahfc4926/6667682961.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/salilifijovedutorevo.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/55635736189.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/17328972033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=trimurti+full+movie+download+1080pPDF 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_off0000b95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 16496 bytes
SHA-256: c4def806bdc7a1c1750a425ff17417568d61a16ca0a79feb786e100eed0d6945
font_02_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 11088 bytes
SHA-256: 86afba1fa175db6b6bca33ef1d98c318cac3460551cb8a3428a3d86b915c5b3a