Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d45f13ab225a5a…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 00:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8bff99caba9094bb22cb846abea7b98 SHA-1: 5228e26f8de8d4424f7a9f879046a69ecfec172d SHA-256: e7d45f13ab225a5a16cc452517c8a438a7b9fa668aeebd399b3bfbec91ef7b22
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://glamour-nsk.ru/ckfinder/userfiles/files/nowifuvaboviwiz.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/47c277f985651e600c6d579c719fb1dd/67158012745.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9a531db9---kufonujodiwa.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a970f5da7e1---jidudajabawemef.pdfIn PDF document text
    • https://wasserentkalkung.at/ckfinder/userfiles/files/23755062172.pdfIn PDF document text
    • http://www.toptehnik.si/images/tijekedijosoxiref.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b96947c45ad301a1e64606a34795b7e6/kogab.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7eaf975a9d4903128df5be59748d8f69/46300765580.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/62625438511.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607302bb48889---zofalebelobesin.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a66529604---bisaluxolesozimezonirizo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d68e236b65d---vosusejotudivijolug.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6d854f04---26133880173.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef43cafd8c---taziguxul.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/01c4c0ab77575435a62cbbe2f50e983d/bevotofosibilus.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/25623117950.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6cf5c021---sabuwigawitodofujisun.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/31087752893.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081396f76e05---vukasawifaduwu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/84617864549.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af83d31714---85447318604.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fal40o6m020msdu6qboautcnj6/fevupenalokibefi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xiwaxemebibejid.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bbf4e3212f71865d6d5163d2c946ecd9/76427464049.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/nn2j25vqnllckbe8cnj7u73742/zutudusudovekiwakusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=coop+and+cami+ask+the+world+season+1+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 11040 bytes
SHA-256: 0edd48e69801bec1dd99cd4e5db6dd272c479344688b7091474be27eb169f285
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 18004 bytes
SHA-256: e3a8b98db1e750125d350d26dcaf485ec165811304b19d64ea4ff6724e07d62f
font_02_sfnt_off000139ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EF 1916 bytes
SHA-256: d329dab12560f33f8f1a89a362ceec380a11aa2236f7cee9ba149751e8509f44
font_03_sfnt_off000142cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1