Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a973295024c1f1c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 01:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f2a68c93ff1a5595e32e5b750adc5aa SHA-1: b4de5bc49fc4b59accd220f642fa773ace704d80 SHA-256: 9a973295024c1f1c582b5d866f71359063e654f29554d60c905d28a7bf9132eb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://madeirashopping.com/userfiles/file/49611607800.pdf In PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/41575778462.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/89948785797.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/lipifatofaxote.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/45032234189.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/84929460152.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c001153471---buperivazugawazijefo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/39387009916e0600deb301426af80492/38454462338.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139de17cba04---kakanepolotapeza.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/25826597004.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/xonotodeg.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/polemok.pdfIn PDF document text
    • http://mousike.it/img_ins/files/71225393712.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/30132883100.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f339ee5bb0---kulorodedup.pdfIn PDF document text
    • https://emenu.hu/editor_up/zifer.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/rapopikudegojelose.pdfIn PDF document text
    • https://bak.vn/upload/files/83442121599.pdfIn PDF document text
    • https://loctra.net/userfiles/file/29823848601.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/wadujipukuxego.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/38130941185.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/71933013645.pdfIn PDF document text
    • http://master-br.ru/img/file/59210032772.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/99264063487.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/81018013653.pdfIn PDF document text
    • https://bagstyle.uz/images/file/mutuderezejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=flix+iptv+smart+tvPDF 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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 10200 bytes
SHA-256: 44282c9c17a4029867be85bcd614010e71eb6d9200da6bf31cc229b95913e8c6
font_02_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 17200 bytes
SHA-256: 090c50ba986e7e430fdd1ed11e16eabbf52f9184de080ddfa4ed4bbb542ef718