Malicious PDF — malware analysis report

Static analysis result for SHA-256 6836c68cd448ed8d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 06:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a44f06e683396306990465812ecf468 SHA-1: 7be201406e8195d80b26849c66bdfe2a971e1015 SHA-256: 6836c68cd448ed8dafeb2706e2e5283a99bc70a53a4eed780878e8b5c2965ada
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.smartlandgroup.com//ckfinder/userfiles/files/63077945073.pdf In PDF document text
    • http://driscollandgibson.com/images/edit_images/file/fikixidofewiv.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/532620741.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/6u5lmoaogd460q844dtk7d3e6j/45653325225.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf04420bcc---sonudimodu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3l015oqbllo95qpmuh13dqpcv1/84321893536.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/luvuxinideloxanesukejarul.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/95290443919.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/77182114866.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ea0d4590---79939348292.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/68522508916.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mtofvkkri7b8nb7480qvn3j4u3/77419670395.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db171318352---87435998019.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/59727186554.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a17e36887---85242729429.pdfIn PDF document text
    • http://esistore.de/userfiles/file/rifafedoridikusapono.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202162165323942.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ade9e8bee704cbdff1b9c3407df60106/nifewexusarujosutiwepa.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/tisexukukunovimabodib.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zadanokikixipebi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b61498d93f767894e31d3bd6c1d222f3/8453614834.pdfIn PDF document text
    • http://93564497.com/userfiles/22035461605.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/38263438337.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb260dae4e---59157963149.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/39473362206.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/31819055208.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/98862745457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fowl+pox+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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 9800 bytes
SHA-256: ed00c7d31cb9c95a1518446ac7bfc8280d8b298698c68e87fd5deceee5bf3c38
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 17424 bytes
SHA-256: 367061110626f012fce18e1c84cfb8a70294782ed1b73c0c03b7d883d1d8aadd
font_02_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1