Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33c5c2c40bb8d13…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 17:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 890ed68571897d96b326371d974156f1 SHA-1: 94fe61c8d868a047426236c6c16a07051b9895cd SHA-256: d33c5c2c40bb8d13442f224473849657a8356befe1b88473ab9947684bbb99a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload storage, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=comment+connecter+android+sur+tv PDF link annotation
    • http://thenext.pk/userfiles/files/19267942938.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/86697964422.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/90865854958.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/52298747951.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/joretubiwuvejidazusaxev.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/kuruziguxovujipumev.pdfIn PDF document text
    • http://aven.su/userfiles/file/xezikewijivexejopivoxe.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/duzutazot.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143e1c886a53---girolikebagejudo.pdfIn PDF document text
    • https://protum.se/file/93073557412.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/9098559136.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/sakujox.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161428273b81da---loteligodoropi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/27000905165.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d5a40f4eefc669121bf812d9e601ab4b/kixadexusifonoxotufunuz.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/jupudabafus.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/62418346798.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/cr52sjnh5157hdd2nrjej5mmt8/66341226516.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/zebugulofugusulinikel.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109121153059897.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/19e01caf977e108191e3bc66fddfa2f0/42524718012.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090910584973499.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/vawej.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tivula.pdfIn PDF document text
    • http://screen.by/images/file/51742827162.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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 10684 bytes
SHA-256: b1fa51c26b6d369ffeffe4b2868f817e230e5a90bbf97376a56af177195caafe
font_01_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 17432 bytes
SHA-256: aa0dfbc371020a9c8622c4674018fb781acb60b5c6054b227834313542965dd9
font_02_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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