Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c099654bed1e95e…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 03:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dc986723a9269797a3acde7ea6da35f SHA-1: bf6475289e0f10ea5b6fe4eba9ffaa2a554a37ec SHA-256: 7c099654bed1e95ee1b9468b2a22a8c57bd09bfdc2fc62a7ad82d7a4600eed51
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

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://synerhu.ru/uplcv?utm_term=bills+in+congress+right+now PDF link annotation
    • http://ahdongjiu.com/upload_fck/file/2021-5-11/20210511011939452130.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/12534576947.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/27p62gnt17ns14i90qf27g1431/70929959634.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/8375886219.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/96918141053988111c637cb0560c0737/60726861081.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e28a40135---zokatonokonukusebojadowe.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0aa6a7f4bd9593be64f5ab1230ca736/disukuwu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/djjiqr059c0h26fonjd37v09iq/24814014998.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/firusumusuvunujovi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/hcdcsm6cm7vf1vv7e55iud83a1/tutakupune.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ff97d6dcceaf84b76bc84f1c7b1980b9/rejopi.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/vewezuzokewozudafomuj.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b162b7baaaa---jufubekikejagude.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/53237628416.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608c715f9810a---10340028504.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/92587618630.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pizuzeloxonoporotuvato.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/majivopegawotabafikusukeb.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160743c80dabeb---suxilibatavafol.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321919242a---22749013038.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad00ca25db7---6664347772.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/lumawef.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6cfbddcbb42b44047bc75a75c7cab386/10395584079.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vf7rrrej43iqcnku5aev5k7da2/27200935484.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_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 16800 bytes
SHA-256: 5fcbdba01e8cf3a7f9d9ce6b360c3da011dd5dd49a09438c41d23f8cd336998b
font_02_sfnt_off000142d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D4 10484 bytes
SHA-256: a047b9847e92aeb5b46be5e5f228a09443807a559e44ec11a8d54136b63c934f

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