Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c1b16ef957e16f…

MALICIOUS

PDF

104.7 KB Created: 2021-07-08 08:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c59d4ae62c4a5e82733fefdf975a1f2 SHA-1: dc197f296d742eb29247d772f4e7faae41935b7c SHA-256: a5c1b16ef957e16f3d080563f4fb29ed86f7d05ca62dbdc0f0677516bae65b29
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with a specific detection of 'Pdf.Phishing.Trojan'. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 6

  • 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.
  • 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.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8h2spm35geo5qk3m9075q6ib8b/94733044087.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d545e78b22d---tojidajopenez.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/29925153791.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8564b3939---temesukoxil.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/29870218266.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/db6be5fe813c01b9deb43b828b0bc5f4/553513532.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/tunajukodanunujefata.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/bigigogejivu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c28eb8221---lakuvusajewodanezixu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b4f93cb50a02cfb46972305efb2f4cc6/reradibemuroregimo.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/96453868401.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/88044497536.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/54081763076.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rmd2gepvfed96hv1vp606l0in6/11872428158.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/073399c989cedc25dbdc3d22704787a0/57979717908.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/20524799438.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/mibawolano.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/irvrj8ltd9i9kbfmbq29qi59k7/dizupemuwawesosu.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b3eafc468598d4e4dec5ea10f0d73011/bejitufugufuno.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bca37ebbeb9---22220850715.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b734c29a185---18249696051.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c3be36d5c6dadc98a6ba180913576ac5/6683149238.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784590c9e48---xuwenejenanisivonil.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daa1117dc9---52977578809.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/91532297325.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/dddf87035eaaa38a53fe2336d907915a/saxoriw.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/93216804647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=operations+with+complex+numbers+answer+keyPDF 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_off00013489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA0 11300 bytes
SHA-256: 6c0dcf5477eecef5c6326849b07e31cc2b99d8aa6b52f37c7bd487a3c51136ba
font_02_sfnt_off000166e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E4 17096 bytes
SHA-256: 4361a25107924a4cd50f47af380d3b04137adb345ae0244c63bf4a606516882e

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