Malicious PDF — malware analysis report

Static analysis result for SHA-256 93893d4fa46e06d6…

MALICIOUS

PDF

87.5 KB Created: 2021-07-31 15:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61e72a008255c92727223c22eeeaca2d SHA-1: 6c23c485687baee533e6dc227c1e462224e5ccba SHA-256: 93893d4fa46e06d668b7ae92136db97daee00249ce194dfe47392ee3f5713f5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=algorithms+to+live+by+pdf+download PDF link annotation
    • https://bloc-immo.com/images/podidilipamuv.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tixukawinexupoda.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/dirosanabubo.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/74176440984.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/kogovafobuwe.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/388irh0m5vl0k7kqk3evqo6un6/rilesukepolesup.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/kixozuxixujebitamitemezi.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ja38auv5fou819lebd20jo027v/direjo.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/lufavukifesunubiwejonul.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/10805419534.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/24819885431.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caac83f993---84887212199.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jekilozaxokewagoxepim.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733c23c2a47---wifotamewepo.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/traudle4uh0a1ic57t0ge31f00/maxegotafavi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/i2t50juv2k4eneucdhdjhlc5sa/90859395004.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077578ceca95---mumizagilerug.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5033092c56---87255226576.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5a243698---porosuzupimetubugat.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161036cfbae640---fawikozajitopitijeduperux.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/lufagagawibiwusojeko.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/zutagikawus.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/mimadulafozutenofog.pdfIn PDF document text
    • https://bloc-immo.com/images/57123186198.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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 16692 bytes
SHA-256: a69274145686ed6ba14fd1fd99a547e42b711e88ec6dca5926a19565b0d18f11
font_02_sfnt_off00013626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 11332 bytes
SHA-256: 2bab75646e852dd14a6aabe4e37c076e18fdb14dbcb0e828315640d3150b622a

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