Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22bc2e677515760…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 16:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d41b5ea3995d21bee99e525bb8865e0 SHA-1: f8d9b8bb4bd98136376aa306856903fde0b4c9ab SHA-256: a22bc2e6775157604aa8cf24cbadd7a074bd7481c0292581e5c83d2d26b7c973
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URIs strongly suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://permargi.com/files/galeria/files/47384367737.pdf In PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/42817381071.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jtdbjp7q6rhhiv20rumkt2i0kh/figudagak.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608416d37ba15---povitubasukewek.pdfIn PDF document text
    • http://live-net.it/file/luwegawefuriguz.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/11143655384.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac04704ee---44631797290.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t3l28ocp2kd4p05rcdqhrg2o29/lefusaruwemu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98e7d1e89---83806885185.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/91650362943.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/rivalekorusukoziwa.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70696abcf---11641232305.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/gijowiwimabizitititebine.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/l9idjlcao2g2um15r0gjmuc4qg/43214165564.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62537991424.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/tadezaregej.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210822_73A721C73CA4F011.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/dotutakexujogosuta.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/5i3u9b0pkn7nt11ms145606iec/88232470246.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/nafomubinimu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c267c78c5be---53736289490.pdfIn PDF document text
    • https://invision.buzyhub.com/files/75737029299.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/11834915732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pdf+to+ms+word+converterPDF 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_off0000cad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 17432 bytes
SHA-256: 3417dbc459849a8ae058a76b1a0f1b376da594dd4be4ec08e99d17730ecdfb73
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 10488 bytes
SHA-256: 84debc3e7ebd04773e0324ed27b6c5148bd142e40f595c7119e76946740fbeee

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