Malicious PDF — malware analysis report

Static analysis result for SHA-256 334747955ac134c1…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 01:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ced2e10b4fb4df83cf3e37c321c491a SHA-1: 7fe6dba96f56ae2e91920e6cbd1cdd00eb820a12 SHA-256: 334747955ac134c1ebf0deb77435609caf1ee2caa04fed0926a670d8d6c1feb5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=anova+test+example+pdf PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f469ff77a4191530f1bb47a47d0f1716/19312793164.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fdc872eada9b40e0b26cc1f0c82d66a0/falilekijutedakufo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//38510697586.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160badd7f9824e---91304748235.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/ropefubobobibuforuwu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/38055858535.pdfIn PDF document text
    • http://semanbio.com/upload/files/77042501674.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb31b98278---fapebeduzilev.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/31pgub7ajbmna6ge72171hb1u6/deragetibivijeberejuvo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/8517194750.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f749c5a7b---38480133144.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/1619575746.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/98832763963.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/11783426319.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a976c615ec3---99045778442.pdfIn PDF document text
    • http://mega.kz/media/upload/files/fexakomekibavezifa.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ec687332eb5a828a6bf3543f307fe9ef/679422154.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608984b901574---26716435876.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609997b881387---tezevafemobetabegif.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53952829226.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3bm2f8phmea7j2c6a0euf82ir3/32908950802.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s99dl5odgjpuo3vam6ergueqds/netamuxogavapurulip.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2a25ad180---54374049431.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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 17188 bytes
SHA-256: 951cac1806c85b839ef28d0e2906d42fa79d323b78c1fff2661709eccf02a5d3
font_02_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 10616 bytes
SHA-256: f02e80c506e6329c67654258402c8f18965a08f0ec15cfda405e87bf7e1eedb2

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