Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1e073169f3fc82…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 05:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9915b9675c550e5fb17eb1408f854d2b SHA-1: bfeea38ee324e832d15455de22b2ae7f8f477669 SHA-256: af1e073169f3fc8286a5a0190e8f12bec52b7e3f95cd7036d529752c41541af5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pensionpoint.cz/userfiles/files/gevokewajuvupupitoda.pdf In PDF document text
    • https://producto.works/userfiles/file/zemakijaxeguxoropezox.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/zorujesejibaweva.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9122568664.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/26351198293.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ca91d70e---86534042996.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210925_D50D87F3DA0159AF.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/7905351647.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/renetamabesakavumipit.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/21206153880.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5o6jcl1u8hj53h06bt5prtqo0t/jemomi.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61424fdbaee6a.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/40780408069.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161497d0fa0e37---56575450413.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/92494425141.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/99018109682.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/fb8d670ecd68a096371b4983fce5633c/60321352552.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/56989890011.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/1490498825.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/xofifusi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148674ef026f---navanu.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/nogozapedudetuxesax.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/75751287621.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gabenapivunozefobital.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cod+mobile+emulator+requirementsPDF 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_off0000b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 17980 bytes
SHA-256: 1a3ce67cda4a292b5101ab15c85fcb2cd5f30f4bf0d163b0480162e55906869e
font_02_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 10824 bytes
SHA-256: 2163ceb54d2189877cfb3e42c2e07e4bc7bc5d06c4c6778314c63c108c203d03