Malicious PDF — malware analysis report

Static analysis result for SHA-256 24218f911c6059a8…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 21:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7ecc512155b67c9c6db2b973267d4f7c SHA-1: 84e1dcd90372b377ce94c0906ef2facc0fefaf98 SHA-256: 24218f911c6059a86cfc03a3dc9f4984ed47d69bf034795025d0cda6fe6e828f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/625f0ac53f1513ad25d100464b888501/gogaragujesademifa.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821badf11b1---jagonujatulir.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108e9e8fac7---92961128783.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/6221873741.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/mawafuvujejezo.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/84177816830b86c86ac19790ceaf37bd/33579218647.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c7b09f5c260cc2f55c0bc9ff71989f7c/88629956679.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/16034856050.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/sopanilagedumanokunet.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3411a8e60b9975b9aa960ac47390edd9/fixebozusip.pdfIn PDF document text
    • http://topp.pl/_topp/file/28326324954.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/tolowibogekuwigukeviman.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/pifasotetiji.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/keriwunufugan.pdfIn PDF document text
    • http://fitviewer.biz/files/file/57932286115.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30663326582.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/77c020b2f3f1fce2bd79492abd66374c/3198611913.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210531205805985.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b55c4691---72427537397.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bff46dc5cee2133569fcea7c7805a918/wowajezuweno.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/77842478265.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8037dd645---64029543079.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/dutexajoxamiwuxil.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/26516776089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lifestyle+in+a+sentencePDF 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_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 10180 bytes
SHA-256: 52089ff7da41035bcc2c8070980449a7a47fe5ff8c1964c813f897d8f462d17b
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16116 bytes
SHA-256: 1f7295b5dc82102c06c2957091de940ccb46ab6893c99a7d977b3344d09e7772
font_02_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1