Malicious PDF — malware analysis report

Static analysis result for SHA-256 35851008abc0de2c…

MALICIOUS

PDF

90.0 KB Created: 2021-07-13 07:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 150a54d896bacd29644f1f2d37daff10 SHA-1: 380595e8a1820edcfb34d3bf81bee8ca01195920 SHA-256: 35851008abc0de2cfec53a05d96f136ce7e4761f3b2a067f5072f90553962a15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point to a campaign leveraging link farms for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://noihoithanhtuan.com/media/ftp/file/47976893660.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ns8pt4jh90t9srrpmmd59c6pd4/26804899672.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/29277782c63fad329ad0132fa02c0731/31146265801.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/31965695325.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/negonejapuzutarisofi.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/19117024883.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608008177b9b5---mesulexegibokojawepa.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abadcdde8fa---natojuwaziziwosu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a921e6672---72688225955.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/01aab045b760879dd925694acbdd7073/34409865544.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/58df5d1a249a43d76cad402e3691034e/78238951019.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4724f5e7---46664510257.pdfIn PDF document text
    • https://linker.tw/files/mepufijivasux.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/zixopowivawojiwikutasibu.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/rivunodokamuvalig.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e182349d80---39113582089.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e64ea0a005e---53296901217.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/j94hq1116k5gkl0q5eqavcela1/pukofukinez.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/40735115976.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/702858dcd0c8f731aa35f95b90ba2999/foledumewadove.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/85e88404ab37643127f45d09e360f7c4/fewozilib.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca26b8008---27878243400.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/20964994654.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088430d2d77c---sidewaketizesozama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+happymod+on+chromebookPDF 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_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 17084 bytes
SHA-256: 4aea2c478a2fc3551fb55fb3687638e4531a944b1e29a62ce7323a3c748e9056
font_01_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 11076 bytes
SHA-256: 2b5fbbc96680d7994dadb03bf1d818d3e03e850bbe2e6c052bd6a94a3c686cf8
font_02_sfnt_off00014290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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