Malicious PDF — malware analysis report

Static analysis result for SHA-256 19460e0e569337d5…

MALICIOUS

PDF

90.0 KB Created: 2021-07-09 21:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c8c354d17b45bf5c2166a34769b63147 SHA-1: 8cf9dc0d289d2c15b14b9ed3d3eef3bfd9729994 SHA-256: 19460e0e569337d5edfd0ba9370521158a61719938cde948dc6f0b50d88523d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations. This behavior is characteristic of a link farm designed to manipulate search engine rankings or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://eminencesolutions.in/resources/userfiles/file/lajewow.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e991604b8---41103382947.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3cfb66711---ramodetigeda.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5df776055ce508df8d5fc764f60b3af2/latunitob.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/1470513994.pdfIn PDF document text
    • http://ezibra.pl/upload//file/kolalolu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8a84b290bf95a62c6f36aba7831bbf6a/29388080111.pdfIn PDF document text
    • http://autovoda.ru/upload/files/20901583420.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6257156a9b---74583315067.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/uoo95l6820crde401j5rl5ue44/213599649.pdfIn PDF document text
    • https://combrooncom.com/contents//files/15496166989.pdfIn PDF document text
    • http://fullx.net/files/gusakifigi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cphtnj2q6s9p8vb3d4aaee5en7/lurekubuze.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/57758687105.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/50755695260.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/23696493991.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/491da4cc1a1e518b88846f9f9c487fed/7877148552.pdfIn PDF document text
    • https://shidoremicrosys.com/media/18870340329.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db193410da---wekunigubivekamesowuk.pdfIn PDF document text
    • http://changdahk.com/upload/rilosit.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/80194897698.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/bb51155e2fe01a6ff13364188bb0f678/58445170015.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/77605395170.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f1086afaf---91387238275.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/34486065864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+free+hd+screen+recorder+for+windows+10PDF 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_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 17276 bytes
SHA-256: 9303ee838bf9995021cb46d22e4cabc5912e48c762b809f93c33d1a77c80055a
font_01_sfnt_off000129d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EB 10676 bytes
SHA-256: 6686aa174df4b4f03e023c6527eb864f024383a89a4d6c24a5271f9b1af1ba7f