Malicious PDF — malware analysis report

Static analysis result for SHA-256 045bb2b7ac7d6429…

MALICIOUS

PDF

98.8 KB Created: 2021-09-16 14:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f7ee04f9b130d93a102d51efe77bc6e SHA-1: 8078dc3aaa2e2514a71fe8595ed04e4a30b646f0 SHA-256: 045bb2b7ac7d64299b2175efb69bdfd77a133b5adfeb173cd894ff06eb2278c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggest a malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/69402680342.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9ddd4e205f35cd093c1ad3aa38fa4772/fakodekapasagebomaba.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/4383201370.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/60132484680.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/gimonuzazirotal.pdfIn PDF document text
    • http://www.moyekolodin.com/files/66941187919.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/88389972943.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/30fc807ba87e4ed8c111d06fb2987ae7/78166283152.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/gikafefinifufozisevuxu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/39434556058.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/bupenufozifafiduje.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/pibirajakifagejo.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/3683506766.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ad64dd69---pipodogozededapapulov.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/teveluvezamuvox.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/dobaxidamebepe.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/22820870865.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/69159333883.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/64940850149.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/dadope.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/65206860351.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/mewuvugo.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/1272911462.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/26115555043.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/56890032962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=javascript+challenges+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_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13257 10836 bytes
SHA-256: 03ddc5733518497407a8fb9fe55e5ed1496cbf35801dab3dedfe5fe2c223f9bb
font_02_sfnt_off00014b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B11 19204 bytes
SHA-256: dacc6a1c44d0fe38fb8814863c284b2081e07de79777e84cdbd605a53123688e