Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f57d5de8cd67ad…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 07:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2d4dbbda940e4f5d556ecf3e49bf3de SHA-1: 05bce52071595576486f0477d5b18673bc6216ff SHA-256: 45f57d5de8cd67ad1fb120f1750bd8435c93da7bc77d14c3a6e262dd9ff36a2c
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into installing malicious software by posing as a necessary browser update or extension. Numerous URLs are present, many pointing to compromised WordPress sites, likely serving as download locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://queure.ru/uplcv?utm_term=spam+kahoot+with+bots PDF link annotation
    • https://seerupit.dk/assens/file/tuzukivexugoxizukefiwexo.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/somemogalufeku.pdfIn PDF document text
    • https://makenie.com/upload/files/memopiduro.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89af664f7---9168536899.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094677e7475c---84492130072.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/33038535083.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b453d4769ce---juxonafirizunuwoman.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d654455f2f---67219563923.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/46449703806.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/30584533237.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/38758514257.pdfIn PDF document text
    • http://alptw.com/images/files/9104556715.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c167e194681---16370452612.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9876470ff1896f5bd87c60a832eb8a85/busofulo.pdfIn PDF document text
    • http://df-2.de/images/daten/file/junod.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/mupozafenirul.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33172040075.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/1qauskic9q1ndarokongvp2q9c/gasinixawadixomo.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/34854517786.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/vasakizojajujudebono.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/senazafizusos.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ed5793f137c3d24affeac88f75c655bc/39335362425.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900726587e1---29503433631.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/sumaripomem.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_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 10528 bytes
SHA-256: d7256700d9fe27d580df252c053eef882ce95e4bcb2eadc2e5b3b6d8aef939ea
font_02_sfnt_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 19472 bytes
SHA-256: ffa200b3539ec48bb4c589567f85eac8e70302941433874ac278e4c550ded0b2

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