Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59f84bc230a5198…

MALICIOUS

PDF

90.1 KB Created: 2021-07-09 19:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dcf8c96026391673fde6a9d5c9e238da SHA-1: d133df031824aeb996f6f33e186072755d1b65da SHA-256: a59f84bc230a519808bf5b54a60e223889254cc9a9f70d19932a6f80d2c0c95e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to host malicious PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb68a251b6---94680350508.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c889b4e1---nugilogeganu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/215c3e32aea5d92aae457339e1120de7/pudevevinozibolaw.pdfIn PDF document text
    • http://indemo.pl/Image/files/40847010388.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/duzabowelalejazalom.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9kus5dhug804u1j7gaeqs9r43c/41309401868.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094590645f49---43188017737.pdfIn PDF document text
    • http://kbchina.de/upload/zazafovasekijalube.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9e187f65ca633967a8e7d626d0785634/webamilejiwovorezup.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891cfcb02af---dalubutimisaki.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/53282726180.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fda810831d4e0c67ce5c2af6c9b91633/winijoz.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cdc04271c260f8a09ae0b057770b5540/gujojajudisefipin.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/a03q8egeqm24643l73b1mg0kp3/xuzozuwegodiwonoxa.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b71804275---68113606738.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a9d4dd24d36aab3489cf04c7ac985b1f/sikivoma.pdfIn PDF document text
    • https://soechi.net/userfiles/file/6883833025.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/86359126028.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3th1lb1oug27urteh4t1r1umap/pomudolaw.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7458c83671---12297340932.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8f4d67a8259ee813432a51601c5219da/masefudikaforofozupebugi.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/16813808915.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/59b159ed2ed5be31b4942eb677d250fe/zekudinuziwewuzibedut.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/33276866067.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fkaj6u1hm2hbp122p14hu31487/vukajememagivig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=arabic+calligraphy+software+free+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_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 16720 bytes
SHA-256: c2a902e668c0c91fc2396df1712d9c0999c564c890658e56730f49a92b5ec394
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 11220 bytes
SHA-256: 5cfe63cb6eff0e91aad6439b8db911cc4b93acf6cebfd22bff3ef4b1527ef0e5
font_03_sfnt_off00012cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 17196 bytes
SHA-256: 454e80ca84dc05d4e66bc3f568127e5908ce77fce7217f75dd8f9b5c50d9abc1