Malicious PDF — malware analysis report

Static analysis result for SHA-256 44671bacad075643…

MALICIOUS

PDF

144.3 KB Created: 2021-07-23 16:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2fa3120b3a5e4e8489e3c107a5e96a24 SHA-1: 8c877124b3b02157584580cfa61a74c24b5f5d77 SHA-256: 44671bacad0756431f1d1c197dba9fdfad31d5240d571b8bedc81946581d2252
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79f94bb77a---14939446915.pdf In PDF document text
    • http://www.alfapilates.pl/upload/file/lozugime.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/kor5jc1neconcvddl4ohtoj2p2/61429147127.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408306129e---xunerejarozubupi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/hphii94372johvn8ig55k53sd0/19502093556.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/63218665858.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/xixanuno.pdfIn PDF document text
    • http://candientushinko.com/images/file/93200517008.pdfIn PDF document text
    • https://sanidom.pl/img/file/35658317882.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f65e9c35---kagolufu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160adf9a44273c---95398385999.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/140027401614.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/p3j4q3nenlj9ic8nrpv3lnke5m/bisevawaniradebug.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93152d882---38459142475.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/18921921492.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608649a47da0d---52759568242.pdfIn PDF document text
    • http://strandedtattoo.net/file/8983696739.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ad67250f2---rukexoxesonuv.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/memomamafenotozazimomik.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xewupomuzomofabaxore.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b414aa0554d065e9323e39bd690cc051/27408675242.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/27tvhoj85j491gbtr8p0glb457/69180427895.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6f4c3457---17139089482.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0b96534e55c86becb563f5ba98218992/lufimamaxokemusejimezada.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/76851742133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=google+play+magazine+free+download+gamesPDF link annotation
    • 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_off0001cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF3A 18356 bytes
SHA-256: 2e436240335cf98634663ae22d3b2a835cda52892201cc118a51ca51c594edce
font_01_sfnt_off0001ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF89 11040 bytes
SHA-256: 84d4e9fa81d216ab692528a0340cbc923435ae0bdaf0fdb85c51c7f6acc0c80d
font_02_sfnt_off00021924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1