Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa71dc6ac1051f4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 14:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afbee997f1718b717e284aad8d4b2dd3 SHA-1: 9e286200f72e3c36df603d364829658b75d92d14 SHA-256: 0fa71dc6ac1051f4cffe9a11c27784bca998fa286ec6f15af53b2190a5c5ae81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a54f558e3---91394240053.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b96baf48---78733079946.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/88766311484.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///dimiperafukepevi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7e27a3d38016f9abd8d56d8c30bfca28/nadibis.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/26188745098.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b175f650---nazefibaxirakiso.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/50335545347.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/sawipimiwadagosus.pdfIn PDF document text
    • http://pnalog.ru/images/file/rojowopigatonalaloxiji.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xefinelibegimabadusemawo.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/sebivalo.pdfIn PDF document text
    • https://nomortiga.com/contents/files/22724365724.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137653c5cfaa---pawofasopesema.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400a57b5735---74721274188.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/kurafexasefipuwiveguw.pdfIn PDF document text
    • https://kueapem.com/contents/files/miseredudexesofirebiku.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/66615836834.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/82759674623.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/24543994613.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb91ed645d---15381291244.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210913232625.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/49355231281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+does+mip+67+mean+on+my+phonePDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/45447259178.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_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 18816 bytes
SHA-256: 260281e642e7e5201e8e7e128fed8c0d34acf28bf9e09860e45f55f08d57458d
font_01_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 10836 bytes
SHA-256: 27c617bc5d353968b883ec80ba7fc93d7f8d15211b7535b4a92417517f710f28
font_02_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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