Malicious PDF — malware analysis report

Static analysis result for SHA-256 1471569e56d8eacc…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 03:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e4d6af2887a95d3e79f023fd35b2d60 SHA-1: e3186d0d0566fe9eaef3fdb5e64f378e3155bb3e SHA-256: 1471569e56d8eacca149b5f50e3daafa9e73ba8bae1c2cb64ca542df389a5793
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://energy-labels.com/userfiles/file/lunudugakerebutukewe.pdf In PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/30065309042.pdfIn PDF document text
    • http://selidbe-beograd.info/files/83352712041.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/80889833991.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ijg6flllelshhtk7f6dnqetifk/91319661757.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/baragewoxokiwunaxaxafon.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/milalanudexilixu.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/pogekumewodusomajalato.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/dd4ee9537f4c0a3d7b5f66a2b43d7e4a/37785539286.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/j7nvvv4366qsmnf5ibfkvf0sl4/27514349918.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/94384138291.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/vunuze.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/85193237377.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/zaxurifubazowebusej.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/40519141530.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/22ce3a1809e2d0e1200dfa16fae33594/44008592246.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090096341b53---favonoxabolasoforejesu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bb85dae84fb69b472e7b93c71dce153a/dofufowurinixexetepox.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zivimusofefubefepofajij.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/10e39a000064001d7aaed956c2246593/58303082428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chava+marathi+book+pdf+download+freePDF 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_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 21100 bytes
SHA-256: 6488dd63b9dcec345143a8927815f9f2990e35eb33c9259e38261526b8371a1b
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 11012 bytes
SHA-256: a0f589332f6b8f8d3d6d7e676304d77835205129d84b8b7c6459c09694451fd3
font_02_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1