Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fcd3c4707a88f3…

MALICIOUS

PDF

94.5 KB Created: 2021-07-04 02:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1d7d2233eb0e37062a44db1b9ccbd89 SHA-1: b3d73d40f6f986dfdbb749b6dd4c019d71e7e24f SHA-256: 72fcd3c4707a88f33b8c887d58d73ba896330c4deb1b7d5f8cc97c73714e958e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains, likely for phishing or malware distribution. Embedded JavaScript streams are present, suggesting potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=the+catcher+in+the+rye+study+questions PDF link annotation
    • https://censcakmu.org/board/file/files/pajubotaxam.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/42692850774.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/luxilifezi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d480837b94e---foxesugarobatarim.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73b44f56e---wewimavorunimopovamo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/46855674135.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/difid.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c37d266b5999648ce7bac31a3fd3cc05/35361564233.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hnucch7882c0p9sjjr5dkr1a42/25474099798.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/tawesepujelikule.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/21732124258.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8ec1fbef---28443507074.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608851bbf2039---58132607952.pdfIn PDF document text
    • https://haidangpc.com/contents/files/79881533515.pdfIn PDF document text
    • https://faprosid.com/file/30068971826.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/19002bcdd3e209ac9b08612fb74e3a89/67631721418.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160965e2293b87---lifemubalivejutobupozise.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079808c1b0d2---64202905227.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/u2ippjs5ffp2igpbft7ft9lk63/manuxowumaz.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/75144274059.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f844e7807---69814605834.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_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001292d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 16600 bytes
SHA-256: f17c1c25cc0780079b2e6dbf6d24b318c6a8c2902e24567a13a72d403b97c019
font_02_sfnt_off00015478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15478 10744 bytes
SHA-256: 5a184214c4fc5cb83caa49db4bedcc2e174ed738dfb04d24a75f569c8d56ca03

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