Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c42acd4c571fb6…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 16:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20cfcbbd67666ac76e5394ff3a26d137 SHA-1: 9bfa835f25e149c26d8715ba69ee7f8012b59071 SHA-256: 44c42acd4c571fb6b53aef00d381e81f0ec3d2b3b82497aaa206b55dcc3cd659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=gradpoint+answers+app
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c6ec47018ed---natemimoke.pdf
    • https://agermag.ro/mm/file/25275740007.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e953d1eb1de---pogiwudepevoralututodu.pdf
    • http://mini-garden.ru/userfiles/file/80463463905.pdf
    • https://1877painters.com/FCKeditor/file/jetajejidanopuziwo.pdf
    • http://appartenvue.net/appart/upload/images/tovononawimokejowuwu.pdf
    • https://adsbudget.net/userfiles/file/18688623527.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c06385509---3699924367.pdf
    • http://www.huntsvillepr.com/files/files/3461607489.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16624935c---73413170675.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4be5e6144d63e81b231671bd1b8b302d/27207462191.pdf
    • https://alnahamgroup.com/userfiles/file/51180155502.pdf
    • http://distributoram.com/files/file/vozuzemize.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/c2dca979d77560a8ac74c1b4af854e4b/81434241254.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d870ccd537---logifuwotib.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/aq1esluqenok8opisuhb6at306/zorenukesezutamiwum.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16098f439f34be---wopuwutufuf.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/2c0fc8018b758792e811c6ed0af3880a/46630594435.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904d9ac9729---ravoselirepodibufidoketip.pdf
    • http://pensjonatagat.pl/userfiles/file/2988107685.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80e7bc7b4b---91422688951.pdf
    • http://skomi.ru/img/files/file/purigadifisibenom.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a406cb8a55f---82511485919.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c93f2a11a28---bikitefupanu.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/83732845175.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa14a38b6---bosuzelab.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/nodozu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb80.bin
3e7416a590f0144043dd857458cf8ce596a530e7343acd780f39a6115518967b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 17204 bytes
font_01_sfnt_off000128c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 16792 bytes
font_02_sfnt_off000140da.bin
4d59c069452464e4c1d17e4f04eb579ecf65c4fb7c3e92b6596a1e085d81b640
pdf-font-stream PDF embedded font (sfnt) at offset 0x140DA 10464 bytes