Malicious PDF — malware analysis report

Static analysis result for SHA-256 047a5c60f34e2382…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 11:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 443ef10fca43c9c3f5c0f9db493da681 SHA-1: 2c07ff492c9b2a0ed5490e34ec602c7042057768 SHA-256: 047a5c60f34e2382cfe969d3afa76e2ec5aa8890b6c4667c615f323bf4b20517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, indicating an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomaquito-travel.com/editor-images/94942531551.pdf In PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/41575778462.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/gewovalojaro.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/tujuvizaxuzoja.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/28488917893.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090322515820.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/83443965144.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/79157867925.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd574db014---dumum.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/zijudewerisigeporilonemod.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/zenogogofimado.pdfIn PDF document text
    • https://domilot.com/uploader/files/dagajape.pdfIn PDF document text
    • http://canvangdientu.com/images/file/laweni.pdfIn PDF document text
    • http://veitali.com/upload/files/8489728075.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde36079db---zodoxojakekarola.pdfIn PDF document text
    • http://eva.am/files/11161d5d66086186.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a829e57101---bivew.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/47519221049.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210909110347.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/vikarijomepifurabafibiro.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a6d11fbf---sumijo.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/83895775348.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/16821293664.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa2e373d5---88582896308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+texture+packs+for+mobilePDF 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_off0000c0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 15372 bytes
SHA-256: 88de1a12b832da493e92d72e48019070a9fe9e47915758e2aa8747edfd1bcd57
font_02_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 11068 bytes
SHA-256: 7d3c322424560ab29f287f34cf6abc66adf63d763e74f61e360767b0daae7a1d

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