Malicious PDF — malware analysis report

Static analysis result for SHA-256 0155545dbf6b2b4d…

MALICIOUS

PDF

82.8 KB Created: 2021-08-15 21:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 904f2703abf600bfbcb13e21b4376a1d SHA-1: 1cb5c8d68587a13dda7865b228c997e6a7c5f7ca SHA-256: 0155545dbf6b2b4de5147a6ca4a84572c72d7695fef293237eaf3e1580e1d570
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malicious content delivery mechanism. It functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and other disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities via the linked resources. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=dialogue+writing+exercises+for+class+9+cbse+with+answers PDF link annotation
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ueu9ct70olhmpuh6n06t3s73mh/44871337053.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9d4949d323ff20bbf65fb5e5666b11e1/11570459667.pdfIn PDF document text
    • http://servmed.net/userfiles/file/xutewigo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838fc42d000---kupumilegiro.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4764c826c---zijoda.pdfIn PDF document text
    • http://fruitvita.com/files/files/ritoxuzenupul.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/3246510740.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e0c6e47f---67742063572.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/35755401903.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/f9vvtq1n6k9ekto5tt4c4c7nff/wudamuluj.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/vuxixa.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ef176fd69---8349256241.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mp1nml3h4skcdirvf3bjodtatl/jevirovimuvadeniruzazomo.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/98232572686.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ehbbdls9rhr4ouj3ri31a322bh/40497388905.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/a0d7669da03a22cf0845770435ac4f2f/vobubedepitozisarize.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/solopokabulufosi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/797e7e6749c2881ecac36183f2db5b17.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0a426806ec72063c731c9c991a9228a7/52760401253.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xarefugebip.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00c4f42e61---95143622483.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/71877356110.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/epric6jlphfc8fpjeotk33cup2/jikozapunipeluvumojis.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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 17144 bytes
SHA-256: 9ea211ce23036e5dfe4458ba4a240dab41c410ab55d72f800ebf563628adf9db
font_02_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 11212 bytes
SHA-256: d116b80d038130670dfe9221478bea0c88adad164b33757ddf282ad3f020e934

Open this report in the interactive analyzer, or submit your own file for analysis.