Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde34ed2c5950887…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 22:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b45c20a1f31815f85f925634671e62be SHA-1: 379c5bd8cd491f133ead44ecc86fadc72660ddef SHA-256: bde34ed2c5950887bf0c0b986da1759a16befd8d876a258e5c1c0a3492656a48
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload locations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs suggests tracking or a lure for specific downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=newtown+apk+download+android PDF link annotation
    • http://pointerboards.com/uploads/admin/files/fovajijefu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143316806e4f---jakubepuvumero.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/93480223364.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/kegaxu.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/11449075699.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/7034413999.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/gesotasab.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/nuzuzanabebokuzubitirab.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/42079458831.pdfIn PDF document text
    • https://iwistw.com/upload/files/67869225489.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/kitapamoxaxasudul.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/28482560351.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/48447073728.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/gunejasomafafivusakon.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130425b19125---48197215957.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/37422158605.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/demivo.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/47355257937.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2qi6n2mqljovd889ddnange836/pigise.pdfIn PDF document text
    • http://sbcnepal.com/images/file/21644286209.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/75056910801.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/natawinabebowal.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/givulu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 10372 bytes
SHA-256: 54488061332e5af5a551bc12cc97ddd1c25f523cd8c9b52b6434ce400711f151
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 17500 bytes
SHA-256: 4d0cf6fa382595decc2fc1cd4d911b35665f0f08a6b2da4c64f5e26737e0890e