Malicious PDF — malware analysis report

Static analysis result for SHA-256 4040f4d6b3939756…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 01:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb7f338dc0fd3e3e0e3f9d5179f90529 SHA-1: 01bafe30c2484be657bf44c996af11b196eab7b6 SHA-256: 4040f4d6b393975638d7860f4a25887c63163b3cf66c2d5b2fb428a1dcb9c11c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://synerhu.ru/uplcv?utm_term=baixar+programa+de+android+para+pc PDF link annotation
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/16951826813.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/pumanigasuzurubu.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/96580918552.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614036fcf0ab8---nematikisoxutonejesu.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/59395917309.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/vokekutakijunigimu.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/66390491393.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/vavexolus.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140247b38bf7---xasifarumegigin.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/16351882350.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/61623535402.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7159ea354---kipeju.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dowovanunojanilebida.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/motavine.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/darugosematotuzilexavafuz.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/22136401644.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/dozinumufokuwimeke.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e530033ec---wefumimadafok.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/21954468609.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/sikekumodu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424a86048b9---23543412824.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/tifigo.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/99485105001.pdfIn PDF document text
    • 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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 19280 bytes
SHA-256: ae63fed2811110fb4eac4a495e8d5131fc56469075e2e61e30097e53af072ca3
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 10700 bytes
SHA-256: 53ac22e9ae4029b3b0e9d46cdc0ad143c1231c59842b1fa05017daece4b8a3ce
font_02_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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