Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bee66154032c9d…

MALICIOUS

PDF

95.5 KB Created: 2021-07-14 00:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c193aa5b19806951034f0fca78358f5f SHA-1: 6a3a994c483838b10c4a61f82cdc74b8668bdf28 SHA-256: a3bee66154032c9d8559de28c56250f7bf762286832afac0dd31069dd2a5a1b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest this PDF acts as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=cognitive+psychologists+view+learning+as PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b747432585c---jesibigewexuvaroxugeke.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/10894189884.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/1i2oko4vmb78krqifu6hp363hl/lujivowog.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba392b225e---64271986800.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/farikapisuxifoburet.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/dinosimabepifi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1350f410c---91553616767.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fe112710---91696935216.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/24993290290.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/74502cf983fc2705d119ab02377c60cc/lobexujugujotulano.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa34db5df---82006075398.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/eed5a59fd7316351239650176a5efdb4/55175973439.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/zemumidekorezeduteb.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0887bdd7802eb37d02516f73fab37e07/gukizamon.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/vukuregemobu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/27269644489.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c06ef71968---63594608374.pdfIn PDF document text
    • http://mosjob.ru/images/file/vexakefesawofazevadej.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077561c510e7---zoxinoneguvamodowiroviduw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4d71d764d---84327647222.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812804acc4f---30203791070.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/63663114513.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c083a9b6fc7f84487bd6c98dfd58b21a/nujufukajeduzofituwifotu.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_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 10948 bytes
SHA-256: 6e7b396c3d69aa02817ab9cf55d67641b6fd4aa3344f77540b2c6c3cdab02e14
font_02_sfnt_off000143b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B8 17324 bytes
SHA-256: b22ed36ab37d67733d565295e7a5d71e46f4123557e8aebdee36f35648ea1e44

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