Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda0804cf3761dc4…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 20:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6df7ed8a05f0d0572d9df5ce3546237f SHA-1: 4c3ed78f3198807de699dc948e0463e43cbbcea5 SHA-256: fda0804cf3761dc4a0dd86fcff8d87906c80c181f61cd1174d70bf6644095b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous embedded URLs that point to various websites, including compromised WordPress installations and disposable domains. The presence of these links suggests the document is designed to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=third+law+of+thermodynamics+pdf+nptel PDF link annotation
    • https://emmaushuis.org/pages/75856170592.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609612aa29a1e---joxerajugotudive.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/nikibarezefowep.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc1aba6bb5---suvasolozemided.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/terodosof.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083523e52f90---42665845914.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/46122c3adf5d0499ef84ca3510f41ba7/17833476923.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/omlei9rdq03n9o4tdsv6fs0tqu/254491930.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u0ctl5t26mdva1h8g2qub8toc4/rulepisexotitiburaxapivu.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/vivefimaranaxukasawofebo.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/jikef.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6722f7685bd3d7e19959445f5ad2dcbb/litavukuwaja.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/daralidosakirojulokebaso.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ef25040fa3ff2e2d88c012af43c0a7f1/dawemunusawab.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/mijuzepizugidi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/womanubedaxabuz.pdfIn PDF document text
    • http://belloverde.net/emailer/file/tekumomimu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bcef3f4ba---54500297882.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/f1gs6ndma010bogj5u3c61mifd/lebakepi.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/51388572139.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/tisenijamegorelatosejani.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/revevedabaveguvawoluver.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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 20396 bytes
SHA-256: a481b9b537cbcd5ecf92c5dab293671f055ffdd654c5cad8c8f93f5d7ea06db3
font_01_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 11048 bytes
SHA-256: 0ff5d96b4f864ea624963bd99cbed08b193ebe49780291b8827f4fff31918857

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