Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b95356670ed9de…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 09:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e734afcd3a682bbab668345c0cc1c7bb SHA-1: 879ab48dabc2ed2d411b97aa75433c48c6c4aa75 SHA-256: a8b95356670ed9de7208a0a82e7cc79ff13205c3b9c764fb06fe8f282c2cf7c1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=custom+date+picker+in+android PDF link annotation
    • http://tvcsoltau.de/userfiles/file/53961580036.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/jereseworowixurofupipuli.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/galejadarek.pdfIn PDF document text
    • https://kenadong.com/contents/files/33028347592.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/31420648504.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/56252658921.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/59692750628.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137759b03b8d---butudude.pdfIn PDF document text
    • https://kaimano.it/file/depusawulepekidiket.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/wuxefelekojexebebibevuxe.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/47181486901.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b77f89483---nejip.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/v6321jeiintru9n3tiovd9k805/78000694757.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/56758104455.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/84269223726.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/votagevitovigof.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbd8e68c49---43553798510.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/21477413986.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/mafosokejalozuji.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/21456730982.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/35757609378.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/30655368860.pdfIn PDF document text
    • http://terrietanaka.com/library/files/49428820163.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da631802fe---sudedaxuwirujapugaz.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/gezebulasobo.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/85865301708.pdfIn PDF document text
    • http://theponghop.com/upload/files/moserupopowibot.pdfIn PDF document text
    • http://lovesenergy.com/file/58523070005.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_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 10852 bytes
SHA-256: f9712527c3894ac34fe481140be4967db088221b526f9d2cdb268e5ff43eb0ee
font_01_sfnt_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 18276 bytes
SHA-256: 7d25957fe502e718959bc4fd82f10054946866eb7f2398fbc8d7584c81d97ed5

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