Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae459380b62ff88…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 06:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e0d79f8ccae3a511e386b34a763eeb3 SHA-1: 85d6bd4fc3b951bfe70919f4cd67905b4c94cbfe SHA-256: 1ae459380b62ff886f9c73f2067f6116678333e261d787259f3a1ef2398a179d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dpt-mh.com/uploads/news/files/33644380047.pdf In PDF document text
    • http://bloodfaces.de/attachment/file/fesupipipesoximinorelok.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/e7924330b94b48448492ce05c0459525/durijopoxulokuzezaxazep.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8q5att1vf0gv5ig2ga82d5ktb7/21948627725.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c387fdc4c9---zosejolimiruvofaregixiter.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/dilorazitam.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160848f34262d4---gepitijowowapuji.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083550865d5f---45516322451.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zanoxejukafubozawijebazep.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/65743608856.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/duwetategexujof.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rl8fia79rk34n6kail2ioivip2/59272058172.pdfIn PDF document text
    • http://serting.eu/userfiles/files/zololomelatesagakafag.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/21600813526.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b36a0b6c2bc---66322677166.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/h7t0ffr3ue7l30kf9n37isqf86/20552134402.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/jufirofapijugemo.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/97990033287.pdfIn PDF document text
    • http://www.celso.org/download/16080626009.pdfIn PDF document text
    • http://voijin.com/userfiles/files/50527270987.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/639c57b48ab07fb0f8b5fda6d2900117/9589631111.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b320c2455d3---89592116588.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/190246147253.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/67136620357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ophthalmology+ak+khurana+pdf+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 18256 bytes
SHA-256: bb3857673060cfdceb30615e4dfbe77d72e1c35b3525ef202ba219d5bafff62d
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 10968 bytes
SHA-256: 0929ae91b1ddf531d5b7cf60c2ceb747adc7cec7dd2175c25f14447b83064b33
font_02_sfnt_off0001202e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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