Malicious PDF — malware analysis report

Static analysis result for SHA-256 effbfe51c907dad6…

MALICIOUS

PDF

80.9 KB Created: 2021-07-20 15:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1da3f7e51ba83822527c9eef92b1aea SHA-1: 0b66bdbdfe3a9d7943159ba2f699db1f7d164f03 SHA-256: effbfe51c907dad6763f914bc6cfb8d5cebb6555c8250ef4b53718e1e6255dfe
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to compromised websites, suggesting it is part of a link farm designed to host malicious content. The presence of a 'download button' heuristic further indicates a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1e925ab295939c6b565cedb97fc352c5/18020215424.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd67e213998---mivufizozazexakuvixe.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/25731733946.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce4b896d9---34261598958.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/pokakibe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc726be48---goragisowupizawexazuke.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/35235730542.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/574b644caecddb055eef4fb37b14ed6e/67522484785.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7c379cca0e4344269f1d1c49d06ce613/lolokomagijixiborumebova.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c61c5a67962---37584260561.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160931f9b92181---xebawanoro.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b84ce859e81---miwunozij.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/40388760837.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/39559100733.pdfIn PDF document text
    • http://zerosquareonline.com/file/xoguzuxatolenenor.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f5de9bd85---faputisoveburagosojagopem.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/19330914845.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sasv7elfut15e4obdh7cm2k1q1/xopapudunezotuwefowa.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/0b878851c15c0896a25ffa5af6117820/kasubuparot.pdfIn PDF document text
    • http://juha.be/_files/file/numaniwevojiru.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/4286308310.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/49398173843.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9db67ec3---voguzufajafurole.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/facb14cb9a53b9023aa2fdd680c90f70/94145606148.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/50558832292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=9th+std+social+science+book+answersPDF 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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 10856 bytes
SHA-256: 658954c7ed6ba4f1a626db4054380f66597e8f01d3a0723c7643e6383c143d6f
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 16292 bytes
SHA-256: 2a67147bb34dce034e46e3453e591e7cc59dd3f120bc2766b0e12a7e50db7093
font_02_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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