Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc86fbe9d9ba6b5b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 20:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 091449a83d5d99666731329d62d6acf5 SHA-1: bca2db1d77ff3b4644eb65cbd57b2ebdd62d3262 SHA-256: bc86fbe9d9ba6b5bcafcde1912c014f73c9374065a32a6ef0bb2e6e5157d06dc
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Multiple heuristics indicate the presence of a link farm pointing to compromised websites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=jurnal+cpm+dan+pert.pdf PDF link annotation
    • http://aaaexpressheating.com/userfiles/file/melis.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/xikisololegaxojiwavo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f5a030761db670a0caed1e084f0eda22/67377448822.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/wibimig.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/38036279232.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/47714789035.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58c478b474---52429347015.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/tiwejujovasujafetebedeme.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/gadibutovetegubibupofenuz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095582b6981a---zefujutefani.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuwokoxufupuwarifebib.pdfIn PDF document text
    • http://erdbau-rauch.at/39269594550.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/fopeboliwosavimulukasubun.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/4604819884.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/dujubadulogowepiwul.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/89721249446.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/towif.pdfIn PDF document text
    • http://maygiaphat.com/upload/files/kujijawulapewemiweliwipor.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/vonuwi.pdfIn PDF document text
    • http://elitvorota.ru/f/file/92611696026.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6521e14963---7919067420.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb6b1b0b20---5885865369.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/mupoteleniz.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_off0000ccc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 18548 bytes
SHA-256: 6c78f8bee2d921dfceb49f6cfe124bdca5d5666914c87b0dc94d675e3bbda220
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 10560 bytes
SHA-256: ba8fac10573cfa04d3759dc22a2dfa377721387174a867b72b96933760d8fe25
font_02_sfnt_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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