Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b612e44d57a12ab…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 15:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ebc59212974e4094891c4e7de4286de9 SHA-1: c8011f1a55451a4c95580f464f7c4e734f994707 SHA-256: 5b612e44d57a12abc8e14e10679dd130e6d8c61fc74f1312fa471e3d8c809581
156 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 websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links further supports this, suggesting an attempt to host malicious files or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://exim5.hu/_user/file/jipakusago.pdf In PDF document text
    • http://cannamelis.com/userfiles/file/muroro.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/ridoxenitodugixamak.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161410d95392b6---71089743508.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/42776333123.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/68701752019.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/zapavi.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/45509915363.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/vogodej.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/82902390387.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa8a7049de---87807118949.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/bupiburapa.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/timozeluzivigukiwo.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/gowojaj.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/18405756780.pdfIn PDF document text
    • https://lapakunited.com/contents/files/19886836256.pdfIn PDF document text
    • http://cke.hk/userfiles/riwemubomejo.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/53576188445.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/futog.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/14580390959.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/98299957908.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/40622664339.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e1b45a11---doletinami.pdfIn PDF document text
    • https://websbag.com/uploads/files/geruzomabizizepuwef.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/kabolilevomamepu.pdfIn PDF document text
    • http://lactopad.com/uploads/files/fufebuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+instagram+without+human+verificationPDF 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_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 11072 bytes
SHA-256: 4d2e3cd6bb31a65e8428100f6b776e24d1610fdac4bad0ca8bea237bce7ae420
font_02_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 15812 bytes
SHA-256: 41d837b3f3adfd8cd4f0d2b5af5813c4343db10e05e8ac2600d90fb94ce36285