Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be51195c0298654…

MALICIOUS

PDF

104.8 KB Created: 2021-07-07 03:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 424925b3f4349c9faa5870e8cef31a9a SHA-1: e23864f5a77db3ed655837461f31940b5ead862c SHA-256: 9be51195c0298654e1b82c987d469d0ef7cefc861946e319a0799faa2ae9b887
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics points to a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/0757e952eeec98dfb19568dda6a648d2/89238472535.pdf In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b32a8bd210---nusuruxukixakid.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/p4humubs497ncmn9g1gsi8cn24/49459935020.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/75697889110.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/4610186121.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/21d06dcb9e87d855a989f4d26d5513c5/98354408375.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/160877cc5b0c01bf9fff6bf46cd7df7e.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/livefotuwuxipufulanizava.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cde087811752cf0df40cd5aa823afede/nutovu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/20db9b3e562c7e124cb9add4685c7d32/32149878885.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2kcnhbcv6b2cfumcuctldo7q0s/44098763028.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607287346dfa4---15338788457.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/313177aa8503c9bd0ef8bb346c53a21c/babevivazajikemusox.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/mo237tipcrr1kkh2logn60cej1/lajapifugolujorevorilos.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/lepomigejilodo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d844ee7e4---39898143621.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f567b4847---88243121457.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/42968492324.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210610112052122.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8a1798bb6470590db33cb2425d530595/samegojidifodezefimotega.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070f85c02f23---82273308935.pdfIn PDF document text
    • http://land89.com/ckupload/files/sodipo.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/27624675404.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c9d056fb---90308780901.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/59d6013c6c90b8fbca437d6f773e9123/tapogel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cooperation+malayalam+meaningPDF 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_off000132fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FE 19052 bytes
SHA-256: b8acd69ce749a8b5f61e35d041454f3c1b60193da2594913db749447a3f6ed6b
font_01_sfnt_off00016413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16413 10572 bytes
SHA-256: e86cc74951c4a68bfd8aa8526f575b7d1dad42ea2c2a5780b19a0c75669ce651
font_02_sfnt_off00017c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1