Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7d224cab466a7b…

MALICIOUS

PDF

106.7 KB Created: 2021-09-05 17:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1d66547ec0b8c0b063f6e23375b129a SHA-1: 644571c17f16ce306f2484ed24ba51abe1988ed1 SHA-256: 9e7d224cab466a7b3b051d2d3b576b495297ce8919a29553f6f1da43529e7772
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to direct users to various PDF files hosted on potentially compromised websites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. While no scripts were directly extracted, the ML classifier strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://aventura-agence.lu/userfiles/files/3099090363.pdf In PDF document text
    • https://www.gcnaura.in/images/uploads/files/dumagidowaf.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/19412111176.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fn5psv9fd550dfu6fm4upcoui3/vukixukoxisiditaneguxir.pdfIn PDF document text
    • https://85097781.com/upload/files/lufexurusefi.pdfIn PDF document text
    • http://m2m2design.com/userfiles/poroguxomozupakatolo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7f55984f4328211a0245c8819e09bd44/32602179527.pdfIn PDF document text
    • https://shibbirs.com/media/files/66338026785.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/99524949636.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611052aa74229---33308379730.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/musagetazokubil.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071b60f65ce6---33443386381.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608650cb4d6f4---36746667071.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fidaxozi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f9bb8a2113ad44f37ffee88928b4d16d/saxoxasovaxevik.pdfIn PDF document text
    • http://df-foundry.net/d/files/majevuji.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0bc1dc38b---17171610555.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/rasuvadesiwixumijes.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/50198778649.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/fadojiverigegipazov.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/bo974mjn6idvtk0hltssrh64te/vodaluropapewud.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/24656553303.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799e018b663---69737166519.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/72014632721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=real+world+instrumentation+with+python+pdf+downloadPDF 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_off00013cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD6 17604 bytes
SHA-256: fb28ba73b98187acd8a520e6ae3efd79a34471aa7f2aa7350ab4f2629f808d25
font_01_sfnt_off00016a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A76 11108 bytes
SHA-256: 38b004e0ce55119169daa4b5e3c601eacff30bc7c9fd1077d79897e711796f6e
font_02_sfnt_off0001843c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1843C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1