Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fa10cbf2778b7b…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 07:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 196bea1a764ec83b8123fc59a416671a SHA-1: 9c560c7a1e0e15710100114a3458a983b8486809 SHA-256: 23fa10cbf2778b7bef504bf27a80efabd1864700140cec0bc65a348dca6c0b30
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and URL patterns indicate it is likely part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=how+to+crossplay+on+gta+5 PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8f636c2a6---10447567303.pdfIn PDF document text
    • http://fitviewer.de/files/file/8724065570.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/45220054236.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6mb93sb2sr37hvrr5m8d41mgrh/devovidepatelinofifu.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210616093244087.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/ruruxusenutitawi.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/86988085472.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f15a13a9069d25b56433e1b2e53ee8a7/manipojirivog.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082c39b35230---fixudutufolisuwigeged.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774fc3af782---84071920676.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/37202918762.pdfIn PDF document text
    • http://ezibra.pl/upload//file/duxilojaboxu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607604b85e409---fujavafagipagotofeg.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/96501086567.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/19199868808.pdfIn PDF document text
    • https://majubesar.info/contents//files/75311615839.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081c8b614253---74832335114.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/dc05c40043da8a9687fce0a4cea06ad7/94357419164.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/45c4c8568096179e45f31b07d1514f26/9913760166.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/fijopinufevizejumodipez.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36f70bbac4---seratusotelininez.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb0b4d4fa---59339294605.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/rakunapofetezitupuvonazox.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_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 17976 bytes
SHA-256: dcd24c307c0e06f170dc2d66f6d82b0ef56ddab01adf14b64d86c8c20ad68a0f
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D74 10652 bytes
SHA-256: b8c9ca3fd81fc6c5b8006cb3231ab054e523e4d5b82fe2c927b3d65bed9a253e

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