Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b958140b41dc0b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 14:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88b2719bf785ddc3aff698f9f7dd3a82 SHA-1: 41919b2adcae946fb0a3f3427951f26368bb28db SHA-256: e3b958140b41dc0bcecfff39fc6e1e15915d9388a686bb474f6c69139836e19d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely serving as a redirector to malicious content. The embedded URLs, such as https://cructi.ru/uplcv?utm_term=final+fantasy+mobile+apk, suggest a lure related to mobile applications, potentially leading to malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=final+fantasy+mobile+apk PDF link annotation
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161331fcbbe615---gasaxaxapavo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f51d5461---bufumevedatesovofuxebarig.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/53181176628.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b394bc1831---nunisepawubefajegedip.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/rurarinafam.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/70109714795.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/83803739548.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374e430f9c6---dugotakap.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/kajezomemoxirup.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/sosedimujemezovuwusezosuw.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/68593847178.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/xixibagukivojosipudune.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210911_41F141AA4B285810.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/76663721254.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/kefevuxazowobenapufe.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/42494118620.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/nisofovadunuxefek.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a213102c3b---fujofexuven.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/48560495581.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613621aa7be3a---22990086597.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/11719916587.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/niratedixowuf.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_off0000c5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 19028 bytes
SHA-256: c4838292855bfd1fa69c875eb36c7901344f4f0f40d46a0766909ae49ea4e825
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 10740 bytes
SHA-256: ae12ee332fdaafe33234fe2008e52d617f4f831b23b163b1eec0b847ad87101b

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