Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cfd2f70fa00024…

MALICIOUS

PDF

82.0 KB Created: 2021-08-07 02:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9758c9dba849facdd6877b77a01b5362 SHA-1: aa2247a68a37d8316aeb6916a230f5de0f3ba6e2 SHA-256: 45cfd2f70fa00024f67f6022c96a517d0c6f66f6b6759e0b4963d35c932738c9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious sites. The presence of external URIs and compromised CMS uploads points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfddc6cf605---kutuwizajo.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b2c813468---devixezoritumabezezaxi.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/posesudiru.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/fegatisun.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077a84f48e---65922553240.pdfIn PDF document text
    • https://tepihtrava.rs//files/34770186451.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/97731656144.pdfIn PDF document text
    • http://tcihk.com/userfiles/renemosugorinune.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/boucb0rre28gku86q9gtr53561/19361252500.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b7dc12cc3e74f698bce7df164325a49d/gisefirojobuwam.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/genegajirotodemug.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/63676071865.pdfIn PDF document text
    • http://dsraxys.com/uploads/luwudujifipe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5bf1a34fa---monomodigejotofoliki.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/wobujigubarewadetidux.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/73602799997.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/sizexodew.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a433497c1---28387434055.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995fee5025e---54575692440.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdeb69fbcb---75464961607.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7354929610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+hack+typing+club+easyPDF 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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 17928 bytes
SHA-256: d263bcb3370a8d603b2e92d665d1fe9e43355423ce877dc80ed16fc7af1da797
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 11076 bytes
SHA-256: f48d13e5317023ec8610168db76092839424f38512467e904c786e4619b5adcc
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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