Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac02f63a2e0a35c2…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 08:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5948d1358c3f91348bd85e4acede7232 SHA-1: 5ffaca3258948d332f3b87fd98aa21351ffbae6b SHA-256: ac02f63a2e0a35c29aa859d638befca6fb00391877bba33144d2af3104d3018a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://shibbirs.com/media/files/36222132225.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/jtlet21j1dgeanpbap38s73lr5/papevif.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e3f46b98d2455d48c6adf88d4dd08581/11260502219.pdfIn PDF document text
    • http://skncn.com/u/files/gosoboxuvupatu.pdfIn PDF document text
    • http://kfbi.ru/content/file/kasunimawivaxif.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f655067f---liwaxamujosuxofeduraso.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/63384192945.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610007953e94f---31435719027.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/pononosemuxokixufob.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/pakofomizikud.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f004e4e01e---nalesagoforatitewi.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/20944451182.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210707_EF4F36300027F06A.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/zesagojifudivewa.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/kerun.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sifutakujulixavukabo.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lamobojisiwotudogapot.pdfIn PDF document text
    • https://majubesar.org/contents//files/wixamefuranewes.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6ea6d44b---kebedobopebibebezipen.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/koxopipuwoso.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/lobezawafuzorojijolepi.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/jikedajezosutoluronezesi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0c7f4e88b---duvubuvomiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=predator+228+manualePDF 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_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 10576 bytes
SHA-256: 6cfa95bb027fecbcb953e57e69a50e16b0c101ed2116a164eec3d341e42cdeab
font_01_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 17200 bytes
SHA-256: 4d5d7c37766d4b2f2971d7a4feaac59ab2989f4091a32ea526b9ed3dbbf03cb4
font_02_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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