Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0526e90820fb6c4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 04:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5b09234b211d3499ca314d75f4dfe54 SHA-1: 95acdff620184e13a584680061254316554242ab SHA-256: a0526e90820fb6c4f1d2cc15d3ef081f31e30e5c5390eb67c30f632c7793b147
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links pointing to compromised websites, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132526e17aa5---pofevuxanodegiwevewut.pdf In PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/jotufefobuperat.pdfIn PDF document text
    • http://thecuriosityshot.com/vamepuxabupelumawu.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/61735786276.pdfIn PDF document text
    • https://iwistw.com/upload/files/27810465338.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/4016275874.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/fubelobakuxugebuxatarigi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b98b7c112---bajuvisemobotodil.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/pusule.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/38530995060.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/60979619603.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/89971990550.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613469bac293a---dagipasokitu.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/29152937621.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/48969333435.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/56687143218.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9fe9243d42ce205cc86f4002df03e983/nodagir.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/395863068.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vurofizugedu.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/60888889726.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/94181467306.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dedetusu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7914dcfc2---12311568411.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/97347403154.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/tilazuwugasemanalumatijod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+way+to+watch+a+movie+with+friends+onlinePDF 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_off0000b3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B6 11060 bytes
SHA-256: 3630eba9f08a1647a7ab6cf29023fb75513cdd2e4f7fd1de9fa59c9883a146ac
font_01_sfnt_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 17540 bytes
SHA-256: 8ddb491c377a9bacbf6a87c61fe52cb98bf4abda2ad450e66a6d05610983f856
font_02_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1