Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef775671d1ea24f8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 07:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34bdd3f739b4fedf09c02586e589d017 SHA-1: f8d6a2874bf8ed2e8ca93edd9697a748749751c1 SHA-256: ef775671d1ea24f8bb44eb5de2aff4485d5f1a50d03dbfa6e283cea6a164e591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=the+holy+cow+and+other+indian+stories+pdf PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef6e9c704---fenidafobinunu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160739e362b956---ropulesogefupukibo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160886ea7b6504---depixixupemutap.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6l820p03av09hobsci54ueekj8/juzavatiwigijigev.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/64188933767.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56676939ca---23511996691.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/dijarimuvosikozuf.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/jogolubujidubivazisulix.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/nibisubatalorefipufineg.pdfIn PDF document text
    • http://gawwaclsc.com/app/webroot/upload/files/dozitetejojoku.pdfIn PDF document text
    • http://df-2.de/images/daten/file/5357305201.pdfIn PDF document text
    • http://sksound.com/userfiles/file/koxofikonilejan.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/61e710813bdc57b60cd2f00e234fb7e2/40739186093.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6657ff7c0d0248eb8d6c19c499439567/tarikovilipoxosamubimezob.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///pozezevalajafamubibid.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/58a8dac54a0d57220de7fee217a0d616/69670418085.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160af88d1482f3---11488468875.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd98c409333---jorewalubuziwutoxumap.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/naganafulukapapabula.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/fepakemitapasepan.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e1e92333ef4714ebfdb5c638a96ed643/7549504612.pdfIn PDF document text
    • http://dzbnf.com/upload/file///50140034122.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/31f89d7a766d8857d650d89f940613ca/xivedikuzaguxosamet.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qlqn0dmb7ejlb11ht8ff1gf702/pojitamat.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/dadowanila.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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 10880 bytes
SHA-256: c20558d81a0002acfc8d0d2795e030791e64b0cf8902de1144740929a8a95007
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 18140 bytes
SHA-256: dab866c99c03d75e84207b9a0928ed604243ee517059608c549e243e9a495fb2
font_02_sfnt_off00012548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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