Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15a949750c550f6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 18:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9be43bba37f25dd0479620790b173942 SHA-1: 1f61bd4fe568e3920f1073deb0d7852dfe18ac6d SHA-256: d15a949750c550f6fd3b23cc48e3ad6dbb54a3d736410ee7b30bad6aafda667b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://taiwan-casters.com/userfiles/file/ponukamasiriseno.pdf In PDF document text
    • http://atomicattack.com/atomic/fckimages/file/65942752752.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/58141676912.pdfIn PDF document text
    • https://mmtours.si/uploads/66247749541.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/k67055u2codjmnnp41587ac5g1/19963475327.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/15252984652.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/75487282568.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/korufodelajiruvopitafudo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee86c078a---gufeteselopepozusetatodi.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/jutimikidu.pdfIn PDF document text
    • https://cartolmania.it/file/58559207575.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dugepizujedoru.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61611779824.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/xazisupobirapetefo.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/81922737694.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8vf4rc9ndvuhl8mbkrnaa12ue9/lujazudofuduridagunopo.pdfIn PDF document text
    • http://elsped.hu/files/file/67370900265.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/dinojig.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/18331449353.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/8385085686.pdfIn PDF document text
    • http://mirrorlink.com/public/files/files/lovizatewijozizoparijipij.pdfIn PDF document text
    • https://izometal.net/mm/file/kelisaxalowenuf.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/ninilazikamozugan.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1048f28bd---zegagubel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bloxorz+unblocked+66PDF 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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 18164 bytes
SHA-256: 77eb2f0d40b07cc986b9ba5d0051367e07396e97f22773f8242138a6358149c0
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10560 bytes
SHA-256: 6be2a6d95bf7733a180dd2e0ac3011445aa4505aa8cd05c8a9bf6aabab51db8d
font_02_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1