Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c45584ca141d035…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 00:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6870d4e66884ec5eeb745f57a2ba1ad4 SHA-1: a1bcb69a453e20eb84a655c5cf5b98734620a242 SHA-256: 5c45584ca141d035f3985666cc48f9ef0715593fc6a870326df3f2b0597cb240
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://1976ahhs.com/clients/32223/File/8894992483.pdf In PDF document text
    • http://dhf-china.com/d/files/94105139524.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/67169267907.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/rerezovozuxogoxarotajuja.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24518cadea---fovoxitefokopijovuvanobij.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/8ab512f779bb507643d3fd57c9bb7c23/16210125851.pdfIn PDF document text
    • http://apcmagon.com/userfiles/44376551945.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/3698267699.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b5ba10e29---63332507066.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/55634902003.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/mopadimizijofalezonow.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/91362995201.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/ninawulakenifituse.pdfIn PDF document text
    • http://dzbnf.com/upload/file///31394597196.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e73537303---sivagiwemuzerarubirel.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e7c1732d9---vevabuvudopigilaz.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/79802414103.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8812edfaf7---xemutoxinidazudegujenimub.pdfIn PDF document text
    • https://777mto.org/contents/files/42460157806.pdfIn PDF document text
    • https://rajakedua.com/contents/files/97282766309.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb56e489c---pupovedod.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a54104964460c8e616b7352170545b4/sogatawoxekomamokuzite.pdfIn PDF document text
    • https://people11people.com/uploads/File/34632644830.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ph9pe7i4cif8nudjsjnj8ci3dl/jezekujipejizuraxupaluw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161237fad11c2b---86265844855.pdfIn PDF document text
    • http://nscenter.cn/upload/files/dugetomazolimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=livro+pneumatologia+pdfPDF 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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 10796 bytes
SHA-256: 7d9fb2d6cbff64c6e1d1c0807d04cdac00c55671403aea9479275ace4330acea
font_01_sfnt_off0000fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 18512 bytes
SHA-256: 1bb1968e915343256d803be6e5072df413cf242f1d1e1f3a7a61036b57f983e4

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