Malicious PDF — malware analysis report

Static analysis result for SHA-256 1008b71b1e32f5e9…

MALICIOUS

PDF

83.7 KB Created: 2021-06-29 11:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5dc833862aec151e54adc67abc6c97c0 SHA-1: 95b9c0cc311a4b7b9b9675e1d8e29da4ea273c9c SHA-256: 1008b71b1e32f5e9954fdf54d856c289977e5f285cf38094ecfdaa8f97d8ad30
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://smidgel.ru/uplcv?utm_term=day+3+post+op PDF link annotation
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d86e873c0---63873696675.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/57106624689.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b6c68e68be9ccc7786f3756c7fc2b829/40474438949.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812a9a43abf---nuwamuxig.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hk7tmt4ub2mpbq3s7gmsdu344/vemexudamedubezawen.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/navenopoxote.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bafddf7e3d9---72713319810.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jirfh0l009ubp7kef7jajvs5fj/zufukidorovawokos.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/napupesepujap.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/17e74cde18249ee10ec1dfff4edecadc/11629556077.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/gl7ed2i1kla4h7dvstflum9og5/kapodaf.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44f3c4821c---jikowixojuxopine.pdfIn PDF document text
    • http://ruresept.ru/files/file/34733595650.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bec8fa644d8---47060489526.pdfIn PDF document text
    • http://guitarenko.fr/img/files/17458367360.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f982b085d7---38316143332.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/51966107385.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/65cee08ebbe8a5360ffc4b5a816e9539/1173257533.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ea9f958c2d3f4dc5029759a96787890f/23013059582.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zirawawumaxaxijis.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/42041300630.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_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 10060 bytes
SHA-256: e0b4c2a03c8e7c8d512746bfb80b9f4c3ff417e6827b3c535806c35f91b58c10
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 17108 bytes
SHA-256: ec8de5dfc89ab710e96b6196dec89b8098255c30d8a89db2f0b1bf129fa946a5
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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