Malicious PDF — malware analysis report

Static analysis result for SHA-256 c546988feabf9998…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 20:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16250a23bd32e0351e034170b75d7a9f SHA-1: a5e917f447e436e695e3ecfebd2e0ae96f96198f SHA-256: c546988feabf99988ed1a92b461bcbaf86c142b4681c8f8eabf207f39153322c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised infrastructure to host or link to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thehero88vip.com/ckfinder/images_store/files/72773636841.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mpkv80hi2bm9ktbqgnuuj5duvj/78228842251.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc88c70fd9---jilopesoxuvivositewobit.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5e01b498794ce55fc584faf95bb47597/tawonowe.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ou2u9147q6qqaeuidihb4ar0t8/tixibabogalevetikot.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/9297299889.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/xukebugupusozelazepe.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5000f6ae6b94c522282a13ef022cd903/tivamaxiju.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/rorageganuzofewosikajujif.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/dareno.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a24c1f45d78177c0448693adad7de3bd/71709155495.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/bshd1q2btva5or2d2tmof3tup5/64230806746.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26de42c500---15302989183.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/utvbdade221t5scbjt59rsvcr3/88167835117.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2c0020e67f7be2e57b14c340b7c93fde/98580824600.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a74f72dc707---42826346148.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d2cd3f1a6d86f2078afaf77cb5b237fc/8549547166.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/sovipobuwikateweruwe.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/84494347153.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fecbe8e7c---98935509807.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/tibukenilabe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a45f5ee7d---1297161095.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b81173feca---povofamozowilunadanev.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/zisixuveguwovajine.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01ae1a036---34479249141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=he+is+mine+and+i+am+his+marvin+sappPDF 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_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 17084 bytes
SHA-256: e6f4671fcec98cab9a2c15c56bdfff6af7071a618562f6fe405ea66adf0945c5
font_02_sfnt_off00012dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 10452 bytes
SHA-256: d0b72c25bd15bf4edf430346a69a4230e35470d939d0721a84f3eac4764a40d8