Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84fb43a222982f9…

MALICIOUS

PDF

84.3 KB Created: 2021-07-15 19:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f07e1e2dad55b388c4ebc51ac2c6e574 SHA-1: 4aff9cb4cd60d36ac047d7e883dbb055973767b8 SHA-256: e84fb43a222982f9a6d3876485793cb5c3d4720a42a7be12024163378f18d44b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vico-immobilien.com/ckfinder/userfiles/files/95562749436.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2c9b3e7ba789543d63cfd63ec1821285/58074970.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/17777302028.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/41533162508.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729feacf221---kegovamofosuwez.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/39f2bb365fca3dfdae38d05988fbc642/sisolifovulemabuku.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/57780358771.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4160532d36---rotinag.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d0d9eb958d7fa3299f3b4659409f6c5c/tuxipofiwojetame.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/vodidosef.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/14372032339.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/74971755117.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/12700373052.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/47450687188.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eff86830820---96923811458.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733d5a9295a---56439166479.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ad794d7eb875d948c5a8344d07c2ffcb/tedusofibukozak.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062906171135.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/46997099443.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dk5mrv8ai25jjb3md3sklknoqd/tasunuvidabobunimomosiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=top+10+most+valuable+companiesPDF 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_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 10876 bytes
SHA-256: c597884eea7137b20bb020921487ad8312a4424019b7839ba3a519fba22c343a
font_01_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 17472 bytes
SHA-256: 59d495abb97af6bfd4d062f8eb54e5d086c9e271e630cf14dcac33a216b47e5b
font_02_sfnt_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1