Malicious PDF — malware analysis report

Static analysis result for SHA-256 9181dcc71536d312…

MALICIOUS

PDF

89.6 KB Created: 2021-07-24 10:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d7da4cf38063e0b846c847781bb27c77 SHA-1: af5d62a90c84c16c16085f06e84cbca7408a0b8c SHA-256: 9181dcc71536d3129503d9eefd50017fc18f21832fe504650cc8dec3236c318f
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate it functions as a link farm, with a high ML score confirming maliciousness. The primary purpose appears to be directing users to external, potentially malicious, resources rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 5

  • 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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/p5p87sc9su6mrhtbd7pi2iqaji/57981265489.pdf In PDF document text
    • http://svsteinfurth.de/radsportfiles/file/riroda.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/37514652191.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/42118487051.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/74251116299.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/38908950049.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/66hdrr86humkpllr686m6r83n2/manaxidurenuxi.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/furobewapowawiruk.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/zulizek.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/99f25a1918afd14aa4982ea121415620/95054991589.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/66010358555.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c748b839d06424b258789bc6da6e9adb/jidofawamorip.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/dt0v163jv4jcq6o4l0l6el8up0/vakinugenalu.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/54731295067.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/saninawikiximonepo.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/pokogitefivugupav.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/zisajiwedu.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/39e5f72f9c2e3b4f7730d5184e2db6a9/kajuwubi.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021072313503253979.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f55ced5d---99016832005.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/tuniw.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/38301999214.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1e60f1a0---fubivekipuzotakiwasukuv.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b5b26a678f3---gumapuzoxepepuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=%C3%BCcretsiz+araba+oyunlar%C4%B1+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 19204 bytes
SHA-256: 1d9549c48153f3758cfc281c4b935b806def981e422d7fc2efcb48bf2ef89541
font_02_sfnt_off000127e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 10924 bytes
SHA-256: 13e6fa6124f1b373fcf5230f85405307fbcbb6cd3cf6b2f65a08adb866ad0e49
font_03_sfnt_off0001412b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412B 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467