Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b83ecd31277695…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 14:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13f4c9cb45c5f508d43f06eb6564ec0b SHA-1: e3aec8786373415ae7ac7cdd1960cd2544a3a010 SHA-256: 53b83ecd31277695694c1ac1b2a0cc5f527f8b18e78d0ec1771f56fcb5559fc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wegofa.com/userfiles/file/xovupekusa.pdf In PDF document text
    • https://gangnampools.com/contents/files/nisiwizeze.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/96488351687.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361304ee039---51303905386.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/56016474122.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/66795919963.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/bikoterotetegudovif.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/61937484920.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/wexibipatopu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/0edkpsmmoseuqjoffqib27rit4/35075261679.pdfIn PDF document text
    • https://33mobility.net/uploads/files/fonerabe.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/36599528789.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb619b4dc7---nijolosefejazaba.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/zibujulofileseteros.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/21874670306.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210917_C032FBA65B95C9E4.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/967607033.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/27722796040.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/vutalefunomimunajopi.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/88628955629.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/61916778058.pdfIn PDF document text
    • https://invest.pl/userfiles/file/64564310235.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/kuwaxakizulefazidara.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dodaserixar.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/biroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+can+u+make+with+cocoa+beans+in+minecraftPDF 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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10964 bytes
SHA-256: 0eb02326ddbed1d4d094796423b751049d44ae07b412f2715d5e865970c4db18
font_02_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 17372 bytes
SHA-256: 6ca89e252218bbf1bc276b3439f399f78a59bdbc7852388edc51a62da5e7d034

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