Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bc12cc134942b0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 18:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97de6075ab888a9db75444a4402c19ae SHA-1: 7a70f04e6b1e826e17218d7584395f6598bbdad6 SHA-256: b3bc12cc134942b0f9661d23b21854113ae6a6090373be9ef9efa61d0c295fec
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the true destination. The presence of numerous embedded URLs, some of which are part of a link farm strategy, indicates the primary function is to redirect users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sportschoolindex.nl/images/uploads/35675216302.pdf In PDF document text
    • http://asijskepotraviny.cz/files/file/20511789702.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/tewusivekuwumiwiwur.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/dewigejitakogifopiporep.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/xibejuv.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec2231880d---kukise.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f335d860b---zelufimofajinal.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8f6724e253f883b1f8efd4308271ecc6/wudoxikerikaxadevetu.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42675611133.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/zuwenara.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39700cffc---46443657991.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/92123835329.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/6250288235.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/35115013566.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/69418429484.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/28115839666.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/magaxakux.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/90981610673.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6469ef81---307651995.pdfIn PDF document text
    • https://qnzar.com/files/39540527607.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210526182713.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/tidozosexili.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/buzimaberatidaxelunadil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lspdfr+fahrzeuge+installierenPDF 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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 20496 bytes
SHA-256: b7af0466cf73b187ac72be0bb49011aa99b017ce1ae6930002f22caf50e0a5c1
font_02_sfnt_off00012a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A03 10776 bytes
SHA-256: fdd5ed4af54d40844a869eea8601b87a9d00bd47a805502d82e40e37963eb0ae