Malicious PDF — malware analysis report

Static analysis result for SHA-256 16147a233be864e4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 22:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 10cb815d41e5302bb8bd20b6d8cdea4d SHA-1: 46e391a39b06e134881c93d397b72a8c3d56046e SHA-256: 16147a233be864e451e3a58687bc78a4a40f1cbace2f81f0385353c788341872
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The 'SE_INVOICE_LURE' heuristic suggests a deceptive intent, likely to trick users into clicking malicious links. While no scripts were directly extracted, the presence of external links and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings indicate a malicious document, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://clubelsendero.com/img_pag/file/35127565217.pdf In PDF document text
    • http://nfc.soo.jp/file/makemidimita.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jazilonigosidibiforituw.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/6768880034.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772d370fc2a---55900410269.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb34d44cf4---96306924840.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b64165816---maxifigunorumo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/67fcf93d8ab329b5b423d3c3fcfd5c0a/10618419949.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1ijtrspujt45bpa8oq2kppi9ho/noxepefemaxilinixejotuwap.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/10343512380.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611a30b090e4a---58861773909.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xegorovakuwogakebafo.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/fewek.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f9e1cac7---nubezoxedidi.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210819_7A86F688EB339A3C.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/xesebaxoxadafeve.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094287e47407---wajatav.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/vegijikuvokagojadot.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/kifininapizitepozugazozan.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/27496648751.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/29823409104.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/jujoxakadufawiduzufudore.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/74bc3663c9480b78510add6845b1fe22/fuxemabupukafimapewixoxu.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/vixusozoboxoxolexaxebix.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/96157570865.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/70063282388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=du+sol+prospectus+2018-19+pdfPDF 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_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 17472 bytes
SHA-256: 22a1411a42604fb4698bc9c5293636c9b688fda6b31bee24941e2f786d9709b0
font_02_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 11060 bytes
SHA-256: f248ecfcf362766659016b0f65669a76c0c65ecedf91c886fcab38ead8ea5346

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