Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d5c6db420385c6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 01:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6445102ddc712e0b0343309246d39617 SHA-1: 012722e15d3a3863b6d5218642149590a22e9266 SHA-256: 03d5c6db420385c61c7da16c21f6aeae744f69e61e99f7b7a6e6831256699054
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document functioning as a link farm, with many embedded URLs hosted on compromised or disposable domains. These links likely serve to redirect users to phishing sites or download further malware, aligning with common spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca3d3f685---26145465659.pdf In PDF document text
    • http://bippex.com/filespath/files/20210913040317.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/denuvilumowivorutit.pdfIn PDF document text
    • http://prota.ru/upload/files/kuzaravazijotifexaji.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/tuzajubupojope.pdfIn PDF document text
    • http://roocenter.ru/upload/file/50636949419.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/16304169824.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/347m4n7sd43m6d175unrr94di1/xasadexotepebewivadifosir.pdfIn PDF document text
    • https://basisnomor.com/contents/files/74664801080.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52537329894.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/48682036161.pdfIn PDF document text
    • http://school15-tyumen.ru/f/64684773231.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/24459456477.pdfIn PDF document text
    • https://protum.se/file/87980498407.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8kbrelqvnpf5strmkihnpgn08t/21068876786.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/66148729110.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/33795031234.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140225f6eecc---19052483873.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/80940352110.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/todamezufat.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/253757c2240191ca601b79681c93a929/xojetuzuxugokajizez.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/wizaxuwewuribatosen.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/gagisufa.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/326311425fb1f107e6d99c024e1a45d2/6099323482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=idm+mod+apk+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d201dfae---dupejoki.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_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 18276 bytes
SHA-256: 8afa69db75691b440ae0aa5a1a9016b46db9b730deb12670d1abb18727723604
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 10092 bytes
SHA-256: cfb2e75fe989b6d3adb8581327e134703fa9e96fa275f6578483734221a7b2a6

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