Malicious PDF — malware analysis report

Static analysis result for SHA-256 853cac493e860d4a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-29 12:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4ebb68efd1e4acf327fd9c1fd6875b47 SHA-1: 1f6a8e6980f10cb8f65aac3c616aaef9d9484e3a SHA-256: 853cac493e860d4a6a762c1ea1bc0b44986a84a464e435fdfd26a207d1a8c0ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the links and the detection suggest the PDF is intended to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://vervesimuhub.com/userfiles/file/62572923805.pdf In PDF document text
    • http://divorcefinance.nl/uploads/file/fimexojek.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lowametodaromasidiravuge.pdfIn PDF document text
    • http://katachizu.com/img/news/files/vidojofutuzakipado.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/14533396297.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/56592839944.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/71quqkl07e30qrm0d0njdvnoa4/tajexuna.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/66215354494.pdfIn PDF document text
    • https://razredna-nastava.net/files/55397455356.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/52749443478.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/ralezozofofatakisot.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/65425735337.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16152fa82d3813---gapetawurewoxosipenozanat.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/1576808469.pdfIn PDF document text
    • http://botroul.be/uploads/51862133071.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f115a1a5d3---gizedu.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614e15bc101d5---2409928283.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/24909581982.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/41524436772.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/zujogovutekapijuxufili.pdfIn PDF document text
    • https://umartravel.com/files/67069075362.pdfIn PDF document text
    • http://a-pluset.com/userfiles/feronomiz.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/lakowejosevapegirukizi.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/53551795736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=aplikasi+untuk+menambah+memori+internal+androidPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/52260760950.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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 16696 bytes
SHA-256: 5e9e2451cbaa0f182fb9bc20573b6c56e7a741b06c41506766f8a91c34672b37
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 10968 bytes
SHA-256: 6c3f35c4252662c45fc0656a593351283f05728622e52cc87a888bf9e16a75cc

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