Malicious PDF — malware analysis report

Static analysis result for SHA-256 268bef127b0937de…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 09:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ce7313c452a499becf4b28755b0f1f0 SHA-1: e7a669e0b6cce629b0b8a8d1ce34240b2b865c3b SHA-256: 268bef127b0937dec737272a53b2b17f4b1fff176828c1e03502677cf099720f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute phishing content or malware through a network of seemingly unrelated websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=order+the+following+fractions+from+least+to+greatest
    • http://dobrasekacka.cz/userfiles/file/44774983653.pdf
    • http://www.ximangsongthao.com/app/webroot/uploads/files/51528804557.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/32066053478.pdf
    • http://sictombbi.fr/ckfinder/userfiles/files/13842816087.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/47442639268.pdf
    • http://fullx.net/files/sedevotogosiwaxedo.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4a3f2cbb---55664095728.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210829080053142.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8648d10bc---pisolugumurobewukebe.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88390a9690---90187045898.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/472f8cfe741aa30f38677a3ccba069bf/fitaliweris.pdf
    • http://bigband-ulm.de/userfiles/files/masowijosekagavun.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b9aab267f---xiziwujafepurof.pdf
    • http://botosani.ro/img/uploads/file/85160714101.pdf
    • https://kampusogrenciyurdu.com/file/41123099377.pdf
    • http://polishingmarblefloor.it/userfiles/files/30806615290.pdf
    • http://righetti1970.com/clients/872956/File/82616231485.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611161bd11d55---gaviveres.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/39738951948.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3ddd78b86de04b1524e5a945018f849d/96964981359.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f205e3b06---wugogin.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078eddfd6465---85859018836.pdf
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/5464851742.pdf
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/jutapigoduzujo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbdf.bin
a25da6d73ae81a4f398d7253190ad1a565de5aac1514a8a824c014c71486e215
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDF 15396 bytes
font_01_sfnt_off0000e2f8.bin
e674f9d2094d1561fe34d05704150bdb15c69d51fbb437090f4f561ade300983
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 11032 bytes
font_02_sfnt_off0000fc4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 16792 bytes