Malicious PDF — malware analysis report

Static analysis result for SHA-256 3023cdb1071a8e4c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 02:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bcaa037a0bbea52c33598ef346b92a2 SHA-1: cf2322e09571648bf1e6bdc21d00c91ae4035280 SHA-256: 3023cdb1071a8e4cb95a48abdeca22f03253cebf719f9218148bfc5238311e99
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farms on potentially disposable hosting indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/da4170ecae1c3bfe9266118271ad04dc/dibawe.pdf In PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210725_3C72F876EEFB725C.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/legurerepodutunaxovowifaw.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fec681900---54757595761.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c453732e9---79048892020.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c633308176---76934391374.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/gewikakovanulusi.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/60536342823.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/zisebe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609476207f182---27008417386.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/mitizefuvovukexewerasuzin.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078601dd73b7---zoxovajopun.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mid417pnu86cm8jcarl46kulp5/38884412154.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/simoni.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/65311523233.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160df4b2ccc636---sexepofexamuzuzitalomok.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/zineruzezebudosukag.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/19999932885.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/vatuxunajax.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/24612005887.pdfIn PDF document text
    • https://tonitomov.com/picture/file/dorapuwuzezanexogosoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kumar+vishwas+new+book+2019+pdfPDF 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_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 21276 bytes
SHA-256: 97063cb6e1b9bbd02ef1132635411bbd4d11e52b77a6afd415d1dca19bb50270
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 11556 bytes
SHA-256: 9cb326d3c401cc41dab47cf0fcdae0dfc90385191455116814dcf7e18c50a533

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