Malicious PDF — malware analysis report

Static analysis result for SHA-256 22615a7396a83a3f…

MALICIOUS

PDF

95.9 KB Created: 2021-09-07 03:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d9678ca5af59298862eac35486aaa5b SHA-1: b2486b777a18c818de6f1a7663768447a5150ffd SHA-256: 22615a7396a83a3fbb0fc707d2c9e0759c7c94b892f4aea9ecaebb7fbbf099a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.agencesramos.com/ckfinder/userfiles/files/6124795063.pdf In PDF document text
    • http://drkoopman.nl/cmsimages/file/84341546.pdfIn PDF document text
    • http://industra.sk/userfiles/file/jobuneketaruvobusu.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210710/file/16258650596843.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/30833935827.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fibefudita.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/kunamevadukuxozetogerobaw.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/e47ji6fvilcimepemmb2du7khc/bajuwexa.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/9883292f722ce20acf8958af997789fb/30660697705.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/81834477263.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/27950994003.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/24163959979.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/10507751288.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/cda036d20b7ef64cbc8879ecdab73704/nodenamerizatib.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e65bf08c504---89347171753.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///4398726261.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608727a5074a5---24942228988.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/90068576598.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bc96095ad---kurokilotenewowufomovogel.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01793a3031---ludopodekuvepuxedozefenit.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/46112076710.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lebavajowikazezob.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/88534053813.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210809214537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=%D9%82%D8%B5%D8%B5+%D9%82%D8%B5%D9%8A%D8%B1%D8%A9+pdf+%D9%84%D9%84%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%84%D9%84%D8%A7%D8%B7%D9%81%D8%A7%D9%84PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00013d40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D40 27552 bytes
SHA-256: 591f50a08a91f4971c87d286c92ad61250e52e3a3d51f5bd0f95d0b2cfe7483d
font_00_sfnt_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 18908 bytes
SHA-256: 84d7240c098d54825abdea91d65a2cc58e273f18bfedefcd61764c9fa6cd7b4c
font_01_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_02_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 21892 bytes
SHA-256: 65021db7b2e901fc202130756bf81c3d0a3ea2657a185c6ea6c693e3126ac829
font_03_sfnt_off000134bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BB 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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