Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19b1e8690faf6e8…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 00:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2decfbfb7a3cdd4ff2998610af73a765 SHA-1: e0532d86b0c9148804bdeda5ff3884f4c2fa5d1c SHA-256: f19b1e8690faf6e86be8beb90eeb40d3cac24cf49d6cb3e92d3b9c5645ac39fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URLs are embedded within the PDF, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards a link farm tactic, potentially redirecting users to compromised sites or malicious content. No scripts were extracted, but the overall pattern suggests the PDF acts as a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=wedding+crashers+full+cast PDF link annotation
    • http://voszveszprem.hu/_user/file/nezunigofekijizu.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/nijemuwigisafifozave.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/levusepekisov.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c190284651---fagubolim.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/dukuriposivumisapumom.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/moxugagekime.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/70632035102.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134144506d2d---rirunutitabebino.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/muzidanojap.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/jijedoguzajafunarima.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/gametakupitiviremi.pdfIn PDF document text
    • http://hotstamping.pl/files/file/52594330098.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/sematawenokojobi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c533471e8504232d3868bd6bb5a9d986/14328804020.pdfIn PDF document text
    • https://mlspoland.co/files/file/pininirevewigez.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/45289302670.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090513522068021.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/joxekopan.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/puvixuzi.pdfIn PDF document text
    • http://mylodge-naoshima.com/xepozokesomexeziganuj.pdfIn PDF document text
    • http://hisunnychem.com/upload/files/vafufuteweb.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/71850017136.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8a4e27f65b2ae9a3212fffd7277f85b8/feniwadajemuxobijoxek.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/sorijetevu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-18/20210918093844227008.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_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 17100 bytes
SHA-256: ea0e277b9831f89876e503285f344712a005a15ec28312ec47e29d5771c57c80
font_02_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 10728 bytes
SHA-256: 21b59dbf1f2b98bc91fe52a86f657cad57e774e7484a9b377ee8e6d32ba4b9de

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