Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c69ba61c1d384f…

MALICIOUS

PDF

80.4 KB Created: 2021-06-25 23:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dd3342356f29350cf86864e2fd9a257 SHA-1: da616e7675d5081a4a1ae9f6617e2595903954a2 SHA-256: 53c69ba61c1d384f1b0b9152f0e93bf2b4653e6579bee253496559cf2aa9792e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://amadpich.com/userfiles/file/95306863727.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a83263c0f8a---59330910269.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/no0i2mrdud9q2a5h9pi3nvumb4/6915698457.pdf
    • http://goref.ru/files/file/22426810395.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac758820d80---44035327722.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8abaf4242a---56443925044.pdf
    • http://abimobiliare.pl/pliki/File/gubamofivosapir.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a9sd1ssoifqp01b7a9qqq9ri07/kuxogabexitarova.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/fixule.pdf
    • http://manajrgvaaradhi.com/cms-uploads/files/9627448294.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16094b55b7ac32---movisododenokabanu.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3650363fe690638c5ac27513a9eff22f/mepaz.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2c3f18d13---tifutomawavavewarene.pdf
    • http://vce34.ru/attachments/file/xozefowifepogagaka.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c66fd4bd92dae53d1968c21405a23eb/90544200359.pdf
    • http://grandp.ru/userfiles/file/solejumavesatonobanogipa.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d603aa2a50d---91583640154.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de515ebef7---56754461915.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160903babe1a8e---15292063437.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e45c42a7a---mizovexitimose.pdf
    • https://mides.vn/images/ckeditor/files/ximapuwevamubuloj.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f235c9ba0---61451869507.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095db78f356e---xutage.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503105643385220.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=online+qr+code+generator+with+logo+free
    • https://.xyz.amazon.com/test/accessThe
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fe.bin
7044b74768a523f4efcf60349dc918b1385aa9e51402e4d21d70ea13daa56a3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 10844 bytes
font_01_sfnt_off0000ed83.bin
51c5711eb900e9dc5f675010e7b7223fbe10fe06b9c451c32fc095b09b806f78
pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 17384 bytes
font_02_sfnt_off00011a99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 16792 bytes