Malicious PDF — malware analysis report

Static analysis result for SHA-256 087b17d44b37a49b…

MALICIOUS

PDF

103.6 KB Created: 2021-09-05 11:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0040785e744a0b95eb6fe71b93a72698 SHA-1: 84b1ee0009861800b0f14effe8eef1c48f6e004a SHA-256: 087b17d44b37a49ba67eac0869dcaf4b57f1954528808ebccece939513bdfd2b
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users into downloading further malicious content or visiting phishing sites. The presence of a 'Download button' heuristic further supports this. The primary attack pattern involves directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://permargi.com/files/galeria/files/13609930559.pdf In PDF document text
    • http://gtshotel.it/images/file/2461655300.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/gapemonupe.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4fc3e43f5412e1421bd7a43bdd92c21f/gepilegegozeruwo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/sewajij.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/norinur.pdfIn PDF document text
    • https://noddy.nu/images/file/77696285888.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/37602662060.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/39342953544.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5c5d60ac4---zaraf.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/47412667569.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/negobezofopefofiwip.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/87949835731.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ce704ca1fd1---pofizumezumizizivofev.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/99908057075.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/23dfc5adadf1e79ed773384925fc8482/texofinewer.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876c64cbdce---pigatukolojebupubab.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0a1a2f3fe1fcdacde667c17d7d6333f0/43636142355.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/kazeviruralefunaf.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a800433c64---79847828742.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/k66qbkvqd7i06faerst60rmm92/maroledasumig.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160917ead0fece---20688048891.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/55221706526.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/75910475329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=history+of+progressive+education+pdfPDF 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_off00012f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 18260 bytes
SHA-256: 9bf11ec708f172a8cb22e7a01fc54f37c5ed3dd88971ea7bc0e0fc14827c14c2
font_01_sfnt_off00015eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAE 11020 bytes
SHA-256: 73bc339511c0cbad657dd98a4a7019ad15f72cb68d710afd6130dccb3d097169
font_02_sfnt_off0001784e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1784E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.