Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3b56a8cf16dbc0…

MALICIOUS

PDF

125.5 KB Created: 2021-07-07 18:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4eeea3bddcc6496934a5c3370eb52d3d SHA-1: e32fd04a663ca4c1bb3f2dc8d19ff75f0360e166 SHA-256: 8d3b56a8cf16dbc024e5a5db266d5cb2906816e31fb9646ad6a06a808c5ba306
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=bertrand+russell+young PDF link annotation
    • http://thedewakohchang.com/image/upload/File/3516775665.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9ikfe83lfk944k20nb19c8jfj7/20202703155.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf43d65586---xaxitajopirinanuse.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/23014415053.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/60654468143.pdfIn PDF document text
    • http://stl-hk.net/userfiles/20101077165.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e8d8ace01b76efa1cb1f596cfe89192b/sewitasup.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577a1b1b9e---33070715873.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160774be4e7abf---nugezumu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/98100345426.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/6sa76o2utm9kog8e5ttcflea5c/26656585086.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/luxuxemiwitifoxipemivofe.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f99ea7c393a11bb772af25a9fbaef47/61200980668.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/96920632551.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kibujob.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755c380345a---73792732342.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096849be1ac4---laxiva.pdfIn PDF document text
    • http://centromp.it/userfiles/files/65526234883.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c465ac4cc43fbd43aef0d7c8f67c99f1/bewop.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160917c42ae1d9---pipigasanomewejapibum.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/77042280207.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/62831919375.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966825657cf---zajiravakadulozug.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/bawozaraluvovuxikofopakix.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072897d124ae---kujiweb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001ca56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1CA56 18596 bytes
SHA-256: 63e1e833bb46cc3d655d10ddcbc6f6536014c1855295622c567f7d50f49c9917
font_00_sfnt_off000167d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D3 10596 bytes
SHA-256: c37403a7f65fc3dec7ffbc069783c5c1dd32714d52e25bfe79cad5b5636cc8d7
font_01_sfnt_off0001800b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1800B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001981d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1981D 19996 bytes
SHA-256: c6475004e187dbd4ff66631ff240c6dd995bfb07427d2790efe747e7aa662729

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