Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36094f5685aca84…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 06:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bda4e68a22555ccb9ee567038e2f853 SHA-1: 59ad441784780286c77b08b3f237d345645ea218 SHA-256: d36094f5685aca843e22493889c480ca2e2e181d5758f56584c0dd9a58ddbe98
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URIs that point to various websites, some of which are hosted on compromised CMS upload directories or disposable domains. This pattern is commonly used for phishing attacks or to redirect users to sites hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://anmimar.com/royal/userfiles/file/lowusenoj.pdf In PDF document text
    • https://techlan.pl/files/file/tenozit.pdfIn PDF document text
    • http://delve-cr.com/uploads/tazegamarugigisegufuji.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077898299552---rikeligafurome.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608456be0b009---gigemizojoli.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c1d611fa507153b1a8e3ed20f3f43687/laraliwinujapeju.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bbfce60d28163d953a309a1929c976ec/33312761062.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/siwuturotojipuwakujinamer.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/wituvokutubugemerisenev.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c60f600139a---47879764031.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l6iintah8ko42tpjr0hqu8nsqe/gawuso.pdfIn PDF document text
    • http://deauville.ru/files/file/44630724814.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1e33c783f0fb5987f6095d723b94c3d7/lijizebazenog.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0kbknam7b7co9l7gu82a34tg40/99722382130.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092086657957---78384095506.pdfIn PDF document text
    • https://bamor.org/userfiles/file/vuzit.pdfIn PDF document text
    • https://khanikango.in/file/bobumevuzeseluxujafuforoz.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f569bc22f---tinojoxez.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/35167483913.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/bibewipez.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/wapozodiv.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/96109041354.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/kebume.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/45202548120.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/dbdc964308725c2e1d19103c864612af/67160209569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=caretas+halloween+para+colorear+e+imprimir+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_off0000b4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBB 11000 bytes
SHA-256: b5247ed9f6fd6980a24024fed8dc41cc83e94f52316b556d104307e65daa32fa
font_02_sfnt_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 14756 bytes
SHA-256: de680d37638fd52b1081ff6c9090bbcf4516e732c076c3777576466317ec37e9

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