Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc1ca21558d353b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 22:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 688fb37abe28ab610a1af7aaa9dfabec SHA-1: 6f9a04fb0d1f6c07292c67832bc48d7b923f4da8 SHA-256: 4cc1ca21558d353b1357307d3ca0b180517d1d02eb6c4dcc9a02ddb2f903ce50
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised or disposable. The presence of a 'download button' lure further suggests an attempt to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://terfigyelokamera.info/files/file/wizizurirakin.pdf In PDF document text
    • http://goldartline.ua/userfiles/file/88108830609.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/45113910284.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23325836572.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55cb519ea1a4da02f3d03f51f725b387/pufelufaradifimob.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109121958276732.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/muxekokunilisejijebalonuk.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631387203.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0d95bddf806963b249d850d9e35b1b07/613606406.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210918_200334.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/sazopememitiwukiw.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/vexilasali.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/metuzuvodi.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/40225976363.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/vamimijer.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/ketif.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161417b2778e4c---25411966764.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/12769832229.pdfIn PDF document text
    • http://prosquash.by/data/sevoxanibalufegalopo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e1e7ca072a19e4a6bf36d2359b093372/77585491536.pdfIn PDF document text
    • http://polletnv.be/uploads/files/60801319469.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/xejatigaxuketalaba.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/logaxusozisan.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/28039832908.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/sawab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=purple+and+yellow+colour+mixPDF 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_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 16952 bytes
SHA-256: 85ebbb0f01ecf4244a5762254ecf730b56a7e957caa2586d3939e1564367feb6
font_01_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 10812 bytes
SHA-256: 0af0f68bfa308a7751edc610fb08db76c65d2ed4d2d802ab4dd453a34cdab372

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