Malicious PDF — malware analysis report

Static analysis result for SHA-256 1252b238cbb00bbf…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 04:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65c030f1eb954944b2151be77da41b65 SHA-1: 28eef5c724c5e33188310de695114c8685087764 SHA-256: 1252b238cbb00bbf562faea02defa59e3ecf38ff417619635f4da65644c46fbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and URL patterns are consistent with attempts to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://huntic.ru/uplcv?utm_term=how+to+breed+a+sun+dragon+dragonvale
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc344b860a---degorudafox.pdf
    • https://nevisnews.com/userfiles/64524201135.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/908aac536e212eaf3a083ee0e992e7a5/jasokemesovadazukegimabu.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4hcvo698mq6lapqlielrh1vana/32543323587.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/69447d82be3e99da96ba96cb2fa46efe/visusid.pdf
    • http://bluecars.pl/userfiles/file/62351995949.pdf
    • http://divapharma.com/uploaded/file/79917360342.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d4e93820---31841071277.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2b5a515a1b426e1981b36ae3f10bf4d5/89868363281.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a214890fee0---73421215505.pdf
    • http://springbook.no/files/sixefeda.pdf
    • https://lescourailleurs.com/upload/editor/file/jaliwevilexigamil.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/502mbudtt0tqvjmkesqmctc9jl/40040698428.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e0575b4f---neribafadimowozexim.pdf
    • http://paroissedementon.fr/upload/files/zonidasudelitezerud.pdf
    • http://vimar.ua/userfiles/files/60797077472.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2e08c730c7e82d0726177d1870a6ab2f/tapolonuzediw.pdf
    • https://peiitw.com/Upload/ckeditor/files/65981130141.pdf
    • http://abacusnancy.com/userfiles/file/fenijef.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c7771867d00---supetinusapijoviwe.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7d1b967bcbe9b055e3ead2853657e17b/nubizogone.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d79eef5bb7188d531748e3906e0934b0/senigukofesajivadib.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd3f0973c9---43467819361.pdf
    • http://mgocsm.in/userfiles/file/fopubaxafifapodonupatiret.pdf
    • http://doyen.cc/images/upload/File/jazupivedugot.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_off00010353.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 16792 bytes
font_01_sfnt_off00011b6a.bin
67dc5251588133ed435bc461e9c4c2174aae3b705ba1f5867b58a7512207d2ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 10712 bytes
font_02_sfnt_off000133fe.bin
fdca2c76aaad105212cc98c2f2cba43ae1bd1713efa938137e1ce4640734a3b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133FE 17912 bytes