Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f92d2dfd7e07995…

MALICIOUS

PDF

82.9 KB Created: 2021-08-23 18:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd071720617ce281a7d026fa8fe1bc5a SHA-1: 71a0cbab1087c7674910e5ad67b7a739ad0d1bd7 SHA-256: 6f92d2dfd7e07995a1381d278c809c8a82721b5bc76d593616e9c0abe48590cf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely intended to lure users to malicious content. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0635c46256---sugebof.pdf In PDF document text
    • https://perfecthospital.net/FCKeditor/file/77107790969.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/fupulatuzujiref.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/a2f3fb2785df79faea485ec2121125f3.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/26667641415.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/91632709760.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b8f4e516b060dda22e64ed9b3b1b5527/18242857351.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/92f96b9509604e97ea1ec59a57f76f2b/fuwinatip.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5bf51ae07---felerebawel.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/vizuponuvagomipakusisubix.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/nexuxof.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/775868f1d852d8beb974193a412decb5/solexalaluja.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fejqutcpgih1mug2uo5de7sgb7/76738142520.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa8f7c8cb5---rakoropuguzorolisizejune.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5d481845---paguxoguvejozugega.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/58199621616.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/4886195614.pdfIn PDF document text
    • https://tigapilar.com/upload/files/debubatituzorumoz.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b2ffdcba75642f0e22d2d69c529f0e8e/77501325223.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e476cf1b244b5fff7d5a15567349ddc9/49899824932.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/07h3j9cjtbuh4illgc8sb1739p/difuzi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e4rcg60nnctsj636km4hk21nk9/jerakitopabijudumutobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+small+hatchPDF 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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 10132 bytes
SHA-256: 0e5622fd53865829f50e4d6e9ff7a5ad9ca0c00be127983f77e91c467fe1a8f8
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 17184 bytes
SHA-256: 13853876bca012ad19b345042b086c5d82af763ce287eb4f440f703a48905278
font_02_sfnt_off00012661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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