Malicious PDF — malware analysis report

Static analysis result for SHA-256 79db05cdd2455d10…

MALICIOUS

PDF

91.5 KB Created: 2021-06-27 13:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8111acf3cf4d4f01ed4a70de06218e2d SHA-1: 65232a36f49cf27ae0413a9cef883fe9d54dddcc SHA-256: 79db05cdd2455d109e5c60fca564cc587a1ed7dfdfb85114f4dbffae30d2db93
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other potentially malicious sites. The presence of these links suggests an attempt to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4cab347966b73d4f379529883c99a86b/28879583151.pdf In PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/hmj63v29n3t9ui3d4qfrk2n44o/tiworemagulakafipaj.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/424896c197d724889eaca2e3c4c2b9f5/29643939920.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/tevejabamekomapu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6807bae7ae3aabe0343090aeaeca2e4/89111228434.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/1dfbc56124a6f4132b9f4380ff7fd60b/48721206630.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092452e29a49---rifibona.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1b19abca11bbe32463bc6082e8cc78c0/xepaxoveba.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608162411b557---20740084433.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3b3d1023775438f9c4512ecd191e2a8a/70160950060.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/014f8acb7873f13a6e7f45d3e3a8ceca/wupezejawogetetik.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee95842b5---sonajovupa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fpr7gf6f325vm4bovo20574k96/devezexivubelex.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabea48531---57273528624.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e17d430ca---81157652985.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/midenagiritu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3f8eb7fceade3fb42b77dd4163e85b8c/netoxetunuluvigo.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/43656114360aaa4c4e43d3.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/25025975450.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/35884205551.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/jobevepofitefoxaxexub.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/noniluvarafogunevawab.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/gaxubibejiximirigowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tracy+melchior+nudePDF 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_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 19552 bytes
SHA-256: 2060dc426757889cdad5c0d42a47d4cd06a0c18348e2e5d702f08120bf17ab6e
font_02_sfnt_off000147b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B6 10548 bytes
SHA-256: 799e14c92c860a0ba2f13dd4043289f332f24fe6cf90245abbeda4f962afc7e3