Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c8ec49e8e0a2e4…

MALICIOUS

PDF

91.2 KB Created: 2021-09-07 01:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 984a01ac23c1134807640c37d45028b9 SHA-1: a182ac82fed538433d56e09dc6e9f650002b954d SHA-256: a5c8ec49e8e0a2e42dc7c32d264f997eb03a50bd70d748655a66b94dd0483f84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e8247eb69d6---soweke.pdf In PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210725_45538EDE9CE73CC5.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/30437970737.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/vinowazonuba.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/zotudeloresijividatobed.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/50568168962.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/12912a7e7a5980ffb3a685334c1cf73f/85868114383.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6e8aa873---wufuzuzatidal.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/tijinujogidifujinodu.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/lumizobuli.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/abe17c36f9b68105ea3441945c02bead/zajegilufonopabexute.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/27302966688.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/famitosub.pdfIn PDF document text
    • http://cpils.com/userfiles/file/2735480569.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9008abogep4fn46ukj210qtgp5/80874763910.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lde0ab5m2v21uubju7vvr6rjr0/72588983377.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/nojifivekafu.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/tq6gvuu20amud2e5apcmqflpem/sifofejenaxoz.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/kaloganobifapimowafa.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607159ca0ab78---ligovowifoninatazuj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cb0be9f95648b608a5d5f8b3774f009d/53286494133.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6b4a160a97f7c4ad444031bcda603e39/40003255563.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/mopune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=eveline+text+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/71070701056.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_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 18604 bytes
SHA-256: 6da41695cfe7f31440196ce21fa0288fa43bbd87bf743c909d1f2e0393bbc312
font_01_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14945 10092 bytes
SHA-256: 757c639d44b035fb5daa6f641170a69a334e8e18fa895a6e63a7bd13b736381b

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