Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f2d76232c7527b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 21:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd9ff77e5db5c3ebe84d114545218d09 SHA-1: 6ac973d78c041ec5bb81f092bdfc312bd389388e SHA-256: b9f2d76232c7527b1d4bbac2bed9a9d2a3403a97d4d2aec0105e6ad20f61f1dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://thy-environment.com/userfiles/files/noniwujinolatojefosisodi.pdf In PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/moxijatodarixamadunodunaw.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/tekibalimagajelaxutogere.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/zotimobodibar.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/powodiseniwufinimi.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/88020876202.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/83392009100.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/lejesixe.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/26184758606.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/nafoselejikegiwezunilav.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/16535346225.pdfIn PDF document text
    • https://pokereshop.cz/data/file/12290812861.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/84869814810.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/2164433011.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/4500495341.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/88891043569.pdfIn PDF document text
    • http://esangsok.com/upfile/files/fipemuvuzawiroxezaw.pdfIn PDF document text
    • http://idcla.net/upload/files/12915168621.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/95584860401.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/45704684645.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210909_DF41A0A1A0E51909.pdfIn PDF document text
    • http://jawarakreasi.com/file/finozajesenipoxebu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8c4964075762eae91271088a20d7133a/lekafamokijabufuz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404db5bb739---9640190742.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138812fcfcef---10031995244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tamil+movies+2020+full+moviePDF 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_off0000b07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07E 10444 bytes
SHA-256: e302c80d345320f1b51ad681f995cfcc44ac988551a95d6e8d846105db606aa9
font_01_sfnt_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 14880 bytes
SHA-256: 0c1b66857f3390c1c2bcf3086504ad16fb55a03705f3699d3c72f7749d4c35ad