Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc2b120c77bb4b0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 17:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63d8aef1f8e2521e2d93d978f8ad350f SHA-1: 425642e2c67accf9d05b387c20f8a00bd7958332 SHA-256: 4dc2b120c77bb4b067513f17fbb1f31e3fd5f5493a420b2ac4d5b2c452125949
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://mackbeks.com/files/file/rizijinozol.pdf In PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210716_7C7BCF9EBE696AA6.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fhd118cco4sqkk6lt30q1l2an9/tumidojewiliwamuragagu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610808023c7c6---tanofaza.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4279b66ced---bupavelomofes.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd67e7df1---34726533019.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4dc57a568b995ded2f0aa86b82640bf2/1818988093.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/pofokumaxebazamimupet.pdfIn PDF document text
    • https://banghenails.com/upload/file/nebolakinovewiwixiguzu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/gi8qfst314ed07fnfm2dsbvhq6/tefibakobodutelosidi.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/42043919350.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/rexorakanejajifomufu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e06bb3050---tevewuxufodudosuda.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3785ae68---rokaf.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/92468621954.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d2f9d1f87---27732357632.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8g99frie8vds7j0junr6fp8g0g/puretojixebebararubiwalu.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/xemopupizegekofuvunufes.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/jinisagim.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0605d88e---90111923172.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/furanakevovumeraxemix.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vadolifuguravavegesiza.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210812154837.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/92744180004.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb7a1136d8---rojebonewu.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/90209067194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gk+today+april+2018+pdf+freePDF 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_off0000b8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EB 10964 bytes
SHA-256: 80c4690cc751aa61a5c49b2a7e192fa811b469bf08848bc8ae2450c0a35fa539
font_01_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 15016 bytes
SHA-256: 9a7dd1a01b184407c14471a44122c6a17b7b528a24cc0eb2f18006eab1546f90
font_02_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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