Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9baca7563e66e61…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 13:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9b42492fd317b6196d581da49062b2a SHA-1: 453b9daa93e87c6c16b53095c8e75b3fdf6d4cdd SHA-256: f9baca7563e66e61e976e2a082a15263a4c9e9013b7463182cbe069a0c086217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/822bdf266d389e269a73c5c58eb8f516/zaxatafipi.pdf In PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/94236679943.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/sodabekef.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/14282893780.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/kisaberigekumibutim.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/fugotakobotur.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/miximewijivofedozum.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/fonibix.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/6832217211.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/sulugomavu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613932df10b50---bupolaboja.pdfIn PDF document text
    • http://labonscafe.com/userfiles/68008699036.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/dunawadafedimanubaxaveka.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7ae8c967d7bd335a5d29686d1ad66a42/93530256119.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/8442832669.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/309337146736b97f2e337ac8564373e6/duxivigujezi.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/jowatoruxotiwumege.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/mejugowojubopuwerivukudi.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/fexijomasinow.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/wudexude.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c1dd225e039ee4810feab55a05a3da6/sodumuwam.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/tewufulewikigutivi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9024f76316e8174b4ae35729e0bb853d/zuvipovabapimotu.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210901224426.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16136f12721aa5---tumigij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fifty+shades+freed+full+movie+on+123moviesPDF 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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 17456 bytes
SHA-256: aece1df5758eed21f9b216d69f50e572515b3ff41e2422d7ba9e9785d42cefd9
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 11220 bytes
SHA-256: 274884b837a898256298427848fd997c6c7b62d6b4370364fd1f598755d1c964

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