Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01dfa809540c1b9…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 23:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6527002565dd1a5af6ea0dd7607f68f0 SHA-1: aa1222e9c8ad1421bea469109382e75835781ed1 SHA-256: f01dfa809540c1b9edda649ea16e77be9f83342678d6e998925f16be2c7a058e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c5d9bdd09---69567865303.pdf In PDF document text
    • https://abofahed.com/userfiles/file/57126963678.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/54871549040.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/faxubidixokox.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/miwezokupewumab.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3ae862d3c53c99b5a853a0056d595332/serobuguw.pdfIn PDF document text
    • http://dzbnf.com/upload/file///62309406076.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/36181663949.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/mepaporit.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/taberadu.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/60383779406.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/sigujapofox.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a5fab086258ec7b2df5e9a399ff735af/tezixeromavepitimabegen.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jd3sqb8s29bl0f4j1eb7i3g2jj/vobaloka.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f457e4d0ca---57023725285.pdfIn PDF document text
    • http://stroi-sistema.ru/img/52534678272.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071304451681.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/rapiragipamod.pdfIn PDF document text
    • http://poorclarescork.ie/images/joserazubozedewutuvo.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/80978793014.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/zikutewepazimidujuvulejiz.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zenara.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210722211021_480860836.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/35981237200.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/4369367020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=curvilinear+coordinates+in+mathematical+physics+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_off0000c323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC323 18216 bytes
SHA-256: 244b0ea4725573cc7f44c659506dec23c9a5d08a2500d34b0fd544115ee9d83a
font_01_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 11196 bytes
SHA-256: 4d7364a44834b6be35dede285cc3b2d3b053030b724f66da2b29bf6ae7ca302f

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