Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f79ebecff101118…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 17:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 37b55d3f513ca31e59f0a5e900b242c7 SHA-1: 6a91ae79481822c0f54e229aba3592142213ffc1 SHA-256: 5f79ebecff101118bb3114c0ec7f3d8ec0fff3cbab0c187bc39efc526fb23e09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fdf94ce1---36173254123.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c06cafa63b5---17360393750.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/pifiv.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/27330818805.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/90393985691.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/raduge.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/joranemunogeluwepubetu.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/tudulowi.pdfIn PDF document text
    • https://ka-base.no/images_content/file/kopawadikiridebi.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/37736026109.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609151afb5bd5---26195539664.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720148197fe.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/bitadon.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e1e1bde5b30d372ba238cdb10e2b9b77/pulimer.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e6b405b2f---lotitodexo.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5925448e99868c559f993fbfc6b17662/xanevozoxob.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9pjfnj5hip3bt372a1beod2l7/mewawizujitokakegiwulor.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca6a26a3a---14002169151.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c357134859---9342956229.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/94554628386.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/23569474073.pdfIn PDF document text
    • http://ibb-online.ru/f/file/19456416731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=100+push+ups+a+day+resultsPDF 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_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 17068 bytes
SHA-256: b46d67ebecbb17b7fc0630488fe5df6dbd84d487147eb90daae30573ed445bcb
font_01_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 10464 bytes
SHA-256: eb099c543c25ad533ad9d0a0878fd92600abd6929cbd70c92cccfaefa9445983

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