Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb963c2deac96f4…

MALICIOUS

PDF

94.7 KB Created: 2021-09-03 19:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38fea498932aca34469bdf55aa7bdb28 SHA-1: 1ba26bc139116da317b830a48195629d9fa085ac SHA-256: bcb963c2deac96f402f6e31fc42d5d4b2b7990a167ede6fae2ed8827f2208ff0
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=general+knowledge+mcqs+pdf+file PDF link annotation
    • https://dobski.pl/userfiles/file/57661022982.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/rikiwodetanelum.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608015717ffc6---kegupomovomebokur.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/zosodawagenukut.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c81802739---migixizusosunem.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/17792662238.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad632da7e---vilojafelafimudumufif.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/nudojigirafalegozezo.pdfIn PDF document text
    • https://clinicscrm.com/img/files/jamominekabadix.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210817_101427.pdfIn PDF document text
    • https://digireg.org/upload/venaxodiribufog.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/9669431263.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/24378021899.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4877c7800abf53d863b541c80efd79eb/14307769105.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/86213074244.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/vigivotegamolo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f41dc85ae3a---tetifatodovexaluzap.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/80733611982.pdfIn PDF document text
    • https://morabia.fi/images/file/mamapanakulezefixabopobag.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bf7e20548---jebum.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/41241703739.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8c73f0de124adc77f1c2acee346ad8c7/62418894087.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_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 11228 bytes
SHA-256: 447b9f20ca9e6a611e08ec5afba544cf8d91518982a15da06fadb613385681dc
font_02_sfnt_off00013bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC3 19092 bytes
SHA-256: 0b5dcd15e8f555471b633bb52c5198e574fe88e1e35eeb0230bd448698eab592

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