Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b775a764e1b28a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 11:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21e291adbce7b42d5a1252a84eef9a0e SHA-1: 969f05de096c3816015d03ba37564544fecec165 SHA-256: 93b775a764e1b28a2f7adb225abe13bf6054c79f62defc061632def3154c4670
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised or disposable domains, which is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://wawabed.pl/uploads/userfiles/file/61274477084.pdf In PDF document text
    • https://fwstc.in/userfiles/file/jixazetonudivolojaza.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/64579301066.pdfIn PDF document text
    • http://dr-temt.ru/images/file/54788340962.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/pawanivinizidafolonofelif.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/kefebajerizefizelirigojo.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/lusizewisav.pdfIn PDF document text
    • http://bakoca.hu/files/file/vusokodapibi.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/dajenoguruwemezisonefiza.pdfIn PDF document text
    • http://yanartextil.com/firma/files/vigeg.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/35104808465.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161316d4fe32a5---lotulasosig.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/38404038216.pdfIn PDF document text
    • http://taxfreepoint.com/file/25212673960.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/64237695304.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/zunarij.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/85147061286.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021092705433873499.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/81f1ebb1a588675a5aaa7d92cc1299bc/gobonimavegopi.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/9832574451.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9025d4fa52e5ac97a5c921c1b63c2ec4/jigutiketozo.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/51799694246.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/58443715835.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/wunilapaduxanuvuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tor+network+androidPDF 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_off0000b7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EE 17964 bytes
SHA-256: 0fab905f2ea50906d530098574ff94e7448d1b2f040235b166544ac134a0849e
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 10168 bytes
SHA-256: 137057d7c105fb6d54c3eba9dc94db034c0916df9f32da7a3338bc48e19b3528
font_02_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1