Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16bebd28a8b4b48…

MALICIOUS

PDF

91.9 KB Created: 2021-09-01 12:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 829b25360860a669fb5d90fd6a443752 SHA-1: b6867fda7fea6ba3edd7566677b7491ef3deb85e SHA-256: c16bebd28a8b4b485c4f84f8f70b68d3feadf455885877748a21a6bd3e85dc00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It functions as a link farm, directing users to various URLs, some hosted on compromised WordPress sites. The PDF contains embedded URLs that likely lead to phishing or further malware distribution, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://queure.ru/uplcv?utm_term=ar+test+answers+to+the+lightning+thief PDF link annotation
    • https://bunyaminerdemir.com/resimler/files/vipulufixe.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a42fb38ef---22001171328.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/80321292677.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/4f912dce23063981d150e6e2996d9468/33588369639.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/drclchhid44525gkqpb5in6b5i/37481199771.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/pirulurekorosasitokud.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995fdb268f1---deradamujivivirajuges.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/56138991172.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/wusugalakobirilime.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3928a105e8d13f97290d663ea5f2499a/nivolekogufekovivaz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074758ceb730---10685825436.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0a6df9e8a08ad5e0b8e65df33b0dc3c3/96912157915.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tamowasokimovew.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/lunejasubofetesoraza.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b3f9c699b---bemakibun.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/47905971382.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f85ddb18fa---raludapejofomolujotito.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/bivekem.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/85ea0a363030819121c3ec21ae9bfefd/fowiribilogepipabelufe.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6f59dl805c1jug7fapp0seeq1m/wolifazororekalikamomobej.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/towedokedavirilojifozakek.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607946aad5c1b---pijap.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/97294399925.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_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 18904 bytes
SHA-256: b7941e662ba7f36dff97bda4c0b01b27ca8fa30e9a3720ca0c7a5f69576dad13
font_02_sfnt_off000149d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D0 10560 bytes
SHA-256: e904ac0dc16f8366697a935d81e06420628f04f83a9ad53c2acec19e80b5b6ce

Open this report in the interactive analyzer, or submit your own file for analysis.