Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa7215c69af8d3d…

MALICIOUS

PDF

86.7 KB Created: 2021-06-12 23:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0e186952036512d41cf4b0b299b727a4 SHA-1: e381c7e3a542e0fe6201f9604d3c27eccd431227 SHA-256: 4aa7215c69af8d3d05b81a3d328ccf88f8dad3f989a256ddb47b61e99c8ce949
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan-d2568dad23a94d95 signature. It functions as a link farm, directing users to download potentially malicious content from compromised websites. The document body, though partially obfuscated, suggests a lure related to an '11th chemistry guide pdf download', indicating a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=11th+chemistry+guide+pdf+download PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945ae0541ba---185875020.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a88bf80bb85---38438634529.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/9969165314.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821afb7d698---vuwusatifur.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/26343026420.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706cf7a2332---fisizebivejojixurojuv.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d0145c02d---jatotusapexazebipa.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/91467360043.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/60398142108.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c042c4dc6---guzikagazawezabodosev.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afc9df1aa56c6b3e3d40776fd0ec8583/fatiwifipilu.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/8b5k2u5em02hrd607vepp3olpv/suwoxetedeweremeki.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a56a558c4---zekarezilexenibuk.pdfIn PDF document text
    • http://allycatering.com/userfiles/farigutaligidunogu.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/vg11diqrnbpm247kvmoik2elii/pejosidunovojelemugesuzer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5720 bytes
SHA-256: 72f33b9ece0ba35162bad876e90e9de50b68532329cb1e0416df500d8a6f56c4
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 15968 bytes
SHA-256: 40fc483dd63207cb57f338a52e10c4c8f3ba9b71b7f2319e0dae0091cd99d22e
font_02_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 10684 bytes
SHA-256: 9f600a7a9b166f4f92ba489aff454631b8bf1199acfb640b27eb3adc007ee174

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