Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d07558c00315994…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 08:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 291a4da8023fa987c54fe15dc4701bdb SHA-1: 8d9854334d8985c144334cf4016f14ef1acf07a8 SHA-256: 7d07558c0031599409257f560c72715a1a17b89d464359741367368686a50052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs point to various domains, many of which are associated with compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b925451c0---lopepolirab.pdf In PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/tefarunakogowamozudofexe.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7337e5cc8e---52820153080.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d8d58be51543f183d7cd06564c29c599/4018706595.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/19457743048.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/s3fcslseau3g7gro7rv80sivuq/70387867435.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/h1q4dd2m6hag7hta0larvovv54/18653874335.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/kenutosobipepud.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/815ee8a62c758f47d0060cebf96dd804/jokogizobujazodefozir.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/97946977577.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5485b767a1f8c24bb90019d9787b3e42/15990320694.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073cea166fb4---joladiku.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/dekevawazaviwujiw.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac895fae529---68947717896.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733d9cdeddf---75930313885.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caeb7cf22e---36555020454.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/jogalireso.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607669bf9789b---22952943337.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/783ab67c78a735ac42b9b2633cb9555a/kepodewoxuzogejegenexavu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/gonepazapuguvof.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a2595a923020773dd69fe027773b479a/lusiwalafa.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/3781817211.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b267f047b1d---57247232907.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/okf1jnr7s22cq6rnfeeiv3bur3/bomujovofotukid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=deck+and+truck+size+guidePDF 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_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 10632 bytes
SHA-256: fb8fbd407d9b119a2cfe9de43f165e0cf3a2d059122381f2841e48f5f22a27a0
font_02_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 17028 bytes
SHA-256: 366f9fe6f633bdd1c258c542cdda4bdea79e04449f6fe9f42bc5f8e737f1a908

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