Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3cded90bee5fea…

MALICIOUS

PDF

85.6 KB Created: 2021-07-05 06:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e508c5e2229afd323331e0680e2bc5b1 SHA-1: a6c239a5a829a380118fae6ec4bef03a8a80500f SHA-256: 4d3cded90bee5fea9f9d8f4016cba2585b40f95654ce576ec1d04c1e69915133
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly flagged this PDF as malicious, and the heuristic rules indicate it's designed to present a large number of links, potentially for SEO manipulation or to distribute further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/f4dnm2t0uqde207r2kkle8b8ul/97603461031.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160be00b88e420---kenewas.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f071192fe0---71854108496.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/39565745612.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/54500082603.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d3437fd9---35498655893.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/fosebavipufisewudos.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf04b00a1d---dejapafuratubabe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ctkjjq6nqltn6l99bbrlgrkcnb/77717967907.pdfIn PDF document text
    • http://bawaniint.com/ckfinder/userfiles/files/vabidenojonabopir.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/vipexoxotenib.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b880c142b0bcb3a97ca3384a03709e33/povaw.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/37510283587.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/voxazo.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/50726728930.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/16011192493.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d73f575f920---71457127003.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e9c68c22---24794068968.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/028d6f69770a01140fe04ef1846d8dac/1603801287.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf67dc0c614---13515373630.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/81136446061.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d311595b33---sidoti.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072f94d8e9a6---16193088601.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5e342f5b4f3268985e323aa90aff3747/78559170100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=biotechnologie+alimentaire+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_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 18508 bytes
SHA-256: c4474d3e85dc41d8de3eb93a77ac3e268987b0f110657da577a84062391b4724
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 10952 bytes
SHA-256: 5a60b3445447720a207343c995c704f3c59e1f1d912677efc60041eae8bdb2a4
font_02_sfnt_off00012fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1