Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bd48080cb223c3…

MALICIOUS

PDF

75.4 KB Created: 2021-06-16 07:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 27091abebc6e971996ab35853e879bee SHA-1: adc445eaaa21ab7de5f587c0e017f10d235b8e45 SHA-256: 73bd48080cb223c3958fb7108d120caac50849d27bffdff3d2d28d023c5e336d
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=conditional+sentence+pdf PDF link annotation
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/982f1aed30892b0aa3fd1210a1ccdfe3/9883914466.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/webijojorubowupuweb.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/46112300230.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ccdab7fe---katuzejupofukob.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e636d0b41---gudix.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/zekeruzufonuxuw.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2276a05092---24076354286.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/790b64d78d30262fd2270c0e75343b04/bikapijagekofodonope.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/guxezirumerenipijo.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d498206f8---kosozugijilipukeduromu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb65f13a56---79499749268.pdfIn PDF document text
    • http://halmar.info/userfiles/file/23166671459.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4ba17c7917bb3dc1221e9609531db598/73493295918.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/68ec0e4d56905afa08d4b990489e9629/10918347869.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccaaed4eb---64470350848.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76844e90c---99922245533.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ff5d556da34d08b048315270a82cd36e/tepatejeweputuzoris.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 4960 bytes
SHA-256: f00a298ce000c811dbd6cf48b1c4bfc0e5182cc36682e1a5ab407288f3363bc4
font_01_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 13468 bytes
SHA-256: 0f2807bfd45f79bd82f9d9ec49815622d2d5a05f67bb81baee3afc37bfe440e1

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