Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90ec4e84816e96a…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 00:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 240a89092b1eb88427612cdaf67f22d3 SHA-1: 69ed3b17a97a431dc898806dd01e3f034a5404de SHA-256: b90ec4e84816e96a5bfaef11786bd294aa2505c2866684af6c839478680c5c0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7d1aac83---31914027738.pdf In PDF document text
    • https://rieker-consulting.eu/files/file/37843797954.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rqn2iuusrfip0cm7vqsioku367/muzutukazijukoduxosoxav.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/44579013e0c8d4dedf106964c0f1cc48/35640628904.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/96021791997.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc3414116---51405264808.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/85451502369.pdfIn PDF document text
    • http://bienbao.org/uploads/files/texizeburugibipu.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/5e22304739117e557b501e90361cb735/65742261062.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e22edbe587031a778b012e6b9852698d/gituvinevepefesitil.pdfIn PDF document text
    • http://soles2walk.cz/data/file/89786095651.pdfIn PDF document text
    • https://tipresentoio.it/images/file/63361838728.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd179a9f90c---nanijokiba.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/sudejedubejo.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/68974070839.pdfIn PDF document text
    • https://aedwea.com/upload/foto/sazakofesozafezexivejiv.pdfIn PDF document text
    • http://qzgj.cn/upload/file/90303490912.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/73769645687.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/05818b985b6c2daa512b7bdef2ce9f1e/wizijupunubexuk.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8da338176495df30b2743f707757da6b/15287540133.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e1db32c2caa81ef9839c777603f81872/64628586911.pdfIn PDF document text
    • https://synersys.fr/contenu/file/gufaj.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18041913d---47282965703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=patient+counselling+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_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 17144 bytes
SHA-256: 2e2edebc06c0e52dd18e879748e3b55334a37c1de3dbb60290e8f8f4fecf93ec
font_01_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 10796 bytes
SHA-256: 8042f5587236193fdf8d251d2158e3a83eedf362e64bb0a8819867f32a48ac98
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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