Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bd44290b21ced8…

MALICIOUS

PDF

82.7 KB Created: 2021-07-18 16:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 824d36dcdfefde62411e89bb921a4088 SHA-1: 5550877fd66d10bc86c7f6ef10b0087d3ad7fc5c SHA-256: c7bd44290b21ced853490aceda43b88530be2d48743f8fa16c9e3033ae1c681a
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0cc5defc9---34053509838.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c046a2d0771---xitepuge.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10cba20ed6---burapuwofilejopavebejot.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/59636646918.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d9967f028---vupewonipebafivivejinetav.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160800139217df---623745291.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda1cdbf3e---jamujapupuga.pdfIn PDF document text
    • http://18554080.com/userfiles/file/28816933551.pdfIn PDF document text
    • http://tochuchoinghi.org/files/sutubusowatesaxanilewik.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/zekuvujukani.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/57367565058.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/10810538784.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/49009910c8b10a45bb56004ef7680190/nanonurovunakisaku.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bce1f098d---godimixofaduronerug.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3236ad62---bopasizozanunosodalojefo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42eb5348d---65067196052.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/jomixoboladikugosikus.pdfIn PDF document text
    • https://mmszke.hu/files/file/2356522864.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790eb11514e---6795886354.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/pomowediteserawisil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+second+chance+shopPDF 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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 10240 bytes
SHA-256: 3d8aff97f23bc09a5f8b00c3553e637ac8f0ce2d1d7cdd97f8d708f586b7a984
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 17560 bytes
SHA-256: 89764fa1ff80f9a9cfb11cf805b7a8bf32050ed7c8eb5175df249148d0e19234
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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