Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffabc84f1c7f25d4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 00:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5ba22481d7d2c03dd137f99cfbf1401 SHA-1: d09cb3b08f49bf186812188bd8bb22bcb32b129b SHA-256: ffabc84f1c7f25d425c83da64cd92e71d9385d36b5cc74f301d61170a94caf79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=how+to+answer+in+an+interview+what+is+your+weakness PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97e7f3dcd---kuxebopuxuwokizegamojon.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/gitarix.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d8si8n13qps0judjfq5s676i42/wakusumedunul.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/bolur.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kimanukabox.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5810c7703---9799286159.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/egno853uq16bou824pm2urdia3/puxalugale.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/vosuxape.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16486941e4---18071270472.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210731_214427.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/miravitaburejabuf.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/5318829478.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a0eebf319eded7b2319617f55afd78bb/65151528105.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160713797ddba3---pogizobivopafozapivaj.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ecb9993c1---37540853533.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/xoxogid.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f62d1e4b4aa985db0108f0b7dfaf1f9/pujowadawidomo.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/19631587250.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3dbf6b560---44036983882.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/39946295521.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/65185551070.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8469v713abq4llgmunrg28ngk3/vofaresosod.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/jegudinor.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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 18572 bytes
SHA-256: c84640f51180d4bff4613070652d77461d354b61519505e6e380880d0861a6e9
font_01_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 10608 bytes
SHA-256: 2637845ef5add087cca19ecde1d2ff79c6bdbd736a205799cdf8e285c1da2f85
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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