Malicious PDF — malware analysis report

Static analysis result for SHA-256 d463ba03c1117ec2…

MALICIOUS

PDF

86.9 KB Created: 2021-08-01 21:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49a2dcf8bffcdbab9475e35d4f6f38e9 SHA-1: e3a0753966911c8a6dc3f8b3121727153819ca22 SHA-256: d463ba03c1117ec203fa864f497fe607431e37674b5ba56e5ca9d847923176ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised websites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and the compromised CMS upload link farm heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26be86534---58815632234.pdf In PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/kedogipaterawed.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf4f4d8d6---kivolegagebanepipuviw.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/pebeboponalig.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ae8cf258e6871ba6d6e89daa64460daf/23469289810.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/23132672304.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/94277922231.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/23947539743.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/dekepinigalofagad.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3i7phmlobabaqnqtru05a3lv70/mogejebetebunomexexum.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920052e368f---dopabomejujeka.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/jitizotupan.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/dufode.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/91579304562.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/322542382.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6015fd5cdb14838ec8d75dbc3ac90417/likobarotewuwo.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/87360531272.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833cd2104cd---zodagaketudowidavezekaras.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160824cdb4de41---89298294417.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/lilalapavuwaxego.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a8cd531f5---33778380400.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210714022644_ij57gg.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/47357841544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ingenuity+baby+swing+manualPDF 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_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 10624 bytes
SHA-256: d7cea3d3b089726b8580af7675cfd00fdd7b65f0322727e27f3ec66f80980743
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 17572 bytes
SHA-256: f750a348498ff2ea346c07aa37fc2831228803f87b90f6712e20c190b35e33f4
font_02_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1