Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d156b790d3f747…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 23:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34aee8e298f215e2e2b538d0ff015d20 SHA-1: 93d5a9b9bf966924e3868c2260980b9468f52e76 SHA-256: 20d156b790d3f74762a2edb5a14838f3b7a62554789d965a846c6210bad01ea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f37849bd---kilusatufoduw.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe807fecf---jolilumotizimolabiwube.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/80258886559.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/mulax.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/78744176623.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/25443063043.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f407b59b09f---51948429407.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/92472516209.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/17242526157.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ea153d219e6a2ffb3c19d4dec3d1063e/76490597815.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3e9cb88d---62154759942.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/rozipijowu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/16957296086.pdfIn PDF document text
    • http://haphadoor.com/upload/files/rudolisid.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2bb9176b---jurakikunobim.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/10892667651.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/23334853075.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44d37c3d2f---15958526443.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/352ec3a20370ef64fd4f72839b79095f/82497118564.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vjvsorhn6a0jufuh6e41cefp94/1115807806.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/6642523655.pdfIn PDF document text
    • http://tyextractor.com/d/files/20178227750.pdfIn PDF document text
    • http://shesob.com/file/files/xedorewolapaxitana.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b7c5094292b1ccd83cb73f0064bc28d2/gugipinijakikopamene.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/96953175407.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r4qks7ja1q8d9s8ckikbku8mi5/naputofagowowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=que+es+el+mercantilismo+pdfPDF 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_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 10940 bytes
SHA-256: cc4508ea5dcf0def7648590b7a92a14279d17d26d8388d2aa9e1ba1e1fd034a1
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 19124 bytes
SHA-256: f748c298a92ee22d8fd3b448543b28be6a00a8a36d7360f126ca1ee97edf2a8a
font_02_sfnt_off0001300b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1