Malicious PDF — malware analysis report

Static analysis result for SHA-256 5827d3f9ca034a04…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 04:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c4a92da0beee19c1b9f4b211d52e001b SHA-1: 87db97a3d709d981a6b5f4005c1260814e8688cd SHA-256: 5827d3f9ca034a04b8ea471a9bc325fa556de15cfb6b2eea808cb2569348d14f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=sop+pemeriksaan+kekuatan+otot+pdf PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39f1831531---81691198786.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75036e7a30---tafinusir.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/rurofekozo.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/tigob.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/nepog.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3qgeinfc53asqa9172b9d7h4p1/11491875275.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/wuwilurefibuxujazuk.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/pifuligakefepigetaja.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6kv8igo714g1j83u661bks2rbb/72971041328.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/710562c30ff8082eefed08bf0d8d2b5f/37171206272.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64349e605---56305834936.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/duzunu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4ca53fd041f8738bb1f1a82a390c2778/gutafetokudisuvesewovidod.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/rejirofilejop.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/178c4c0b1ff282c8ba56575131e40e09/48018613598.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/021929151523.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/gubotelex.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f03212550---51395830642.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/cd12e7c8be9f125fa0d20de649f8de2d/sipuboxinodesomo.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/95393971768.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/kplh5co1lpmus7csjjao26m0k3/gasosimurepafizikolulul.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_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16572 bytes
SHA-256: 0fa369a18c155257beaf84e8fd6bc12e7264a6aa915e75c057b231c1f8250453
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 10880 bytes
SHA-256: 6043dcf211f55c9ad7217457beb3994723572496910fcc0c31dae56ae230d510
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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