Malicious PDF — malware analysis report

Static analysis result for SHA-256 96441d32c6aef978…

MALICIOUS

PDF

82.3 KB Created: 2021-07-04 00:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df879b05aaeacaa1ee6bfc93ef6145d2 SHA-1: 5ca012a93dce4e86db2c390e35673c77528f582b SHA-256: 96441d32c6aef9780128d67c27b68beae04edd6d33af95ef559cb7279728edd6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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 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://paron-rebondir.com/uploads/files/golirabutozaju.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6e884190---38858627964.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a52784e10cd---34564673596.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m9u20d2sckrpq2uae7mqhvh453/81973758806.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/dofemovidodiso.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/98445331601.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/85851584295.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210618020254.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ef39151950448403e010814114be6567/59132138636.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16099e58bd7f4b---guxakokubipo.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/52745255579.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/67662469347.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/palapap.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160887b9d92648---61687266978.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4c275e1b5c93ba8ac13233f509dd0247/rewojilaxig.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xosixowujiroludexub.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/4293241496.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160782d13a5e08---82416154130.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/rediromuf.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b5d85e17f4078df8311fe09d678a0b04/pinidiwazikunuzogovolekal.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d65a3fd02ca---6870098433.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/vusisowovuwipamewa.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/75297198040.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/gatumive.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f503737b---nevinezuvur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1f6ba7f6---81352620003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=meeting+you+was+fate+messagesPDF 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_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 10704 bytes
SHA-256: 5b0dfb3d6b5f61aa4feec1905145f10c506771eec85b041ceb27b16a7635d9c6
font_01_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 17988 bytes
SHA-256: 14a1217f61974c1f3e6d3ed08bb22c9f93e5fa312d485f13ea5ede8afb2cac41
font_02_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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