Malicious PDF — malware analysis report

Static analysis result for SHA-256 049ec691da7a38ad…

MALICIOUS

PDF

76.2 KB Created: 2021-08-18 20:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cfb3b5417e31bfc14bda9c7c4df9c2d7 SHA-1: f7fcd9e9140c98070b140b6fa1ea27859e207335 SHA-256: 049ec691da7a38add7e22ea83c8d2264b414b5792f88e394eea49f455e4a08af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=naqaab+bengali+full+movie+2018+hd PDF link annotation
    • https://ohcsi.com/ckfinder/userfiles/files/83179073429.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb0429f39---susigepujeverorin.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/pamasibemerarumare.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772408b9a33---pakuzogovamamanidatakuv.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/79204895014.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/45704386012.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/boxazeratuguxezivanokabe.pdfIn PDF document text
    • https://avenue102.com/uploads/file/ganeja.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9894d14e440ef88c325b0ab782f20459/masufusulanexes.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/cd2b8b23087c48f28f6315717777f06f/52984551692.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0540af45---40116726215.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/fovofuwibu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631d193495---detanobom.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/kovijigebogegipakugo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6hd36ra1c82g0lqpor1kc6u7fd/92679785006.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/02120cc8a8104e5c463dc332603712a6/rogod.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/63661955d566cb13fe8b4c98a4801b20/xegugejit.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/f408lsarj971jmot8c1j4ujc6i/13298411493.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/xodijofikefezilu.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/bademotujiniwikevif.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160effc21ac32b---vatemusefalubiwukajiwi.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/tofuseraxoworulubi.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/totesinugudu.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/54919363643.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/76299492533.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_off0000c34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34C 11368 bytes
SHA-256: 782953c51d68d997363dbb67073f22ce9c0ae2b42834dc2eed90e7c805a21100
font_01_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16684 bytes
SHA-256: fb5193b8b512606f61b92aba71131196bb3a6e6f722b984904589e18427c4c33