Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb719936bd94dac0…

MALICIOUS

PDF

101.2 KB Created: 2021-06-25 21:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-10
MD5: 17196f2e9ffe924e40afb8a74f1c2a1e SHA-1: b127b72896c22fc2dea365d0a1cd81c0f57e3619 SHA-256: bb719936bd94dac0dc9ad0df97fdd25502eea5b1288935514c81bf583f442aa3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing or trojan variant. The document body is unreadable binary data, but the presence of numerous external links on potentially compromised infrastructure strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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 http://ketnoikienthuc.com/upload/files/29781749443.pdf In PDF document text
    • http://ipsgroupjjn.org/userfiles/file/wokufobojudovati.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/786e5f4b7a4f5a44e3e4802b5b514a8f/xezugogevigonij.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160d288d43198a---gefugana.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/f0796452c06e308c203817ee3f0d3032/vevozisegonamate.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c9ed1e92b973f9b3680210633e2582cf/95054853998.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/67055772768.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/vukiubpr1pf66mfp1bqakfedot/mujikanofavebo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a7aeebaa---vobalisukuvuri.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9de2f56d---71099681680.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210607084834.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c158ea24400---vabizovajagewavodewem.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607701ab2739b---62641657591.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb773da290---55700639110.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3e134acb9---farenugupuwexewifemerixok.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/suzakedu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160776cf02c330---fagixifaxebowoxi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc7406576---wokizuzazoritaxazugifekos.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8433942e5e---benegirilizuf.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vk1f2r7gtcbo08bgg3mnke6rni/vixodajevofuno.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/37542704657.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bcf32dc984d1e8b90a643b2c8d7dd6ce/79362584184.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/letegis.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/2658088154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=blue+chip+jobs+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012e86.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E86 17076 bytes
SHA-256: da59c99f1c91e6708769d56c94752d67f75d804925cf3d9712e97597f2513f38
font_00_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 11048 bytes
SHA-256: ec308ae168eb2e538b820814c38f6ae5079dc65a1b98fb2310ec87b1bf60b22b
font_02_sfnt_off00012309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 2756 bytes
SHA-256: b7291412e5ab6bc833dfe4d845a62052e45f270fba03383468634f211072b255
font_04_sfnt_off0001476c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476C 30480 bytes
SHA-256: 6d2d7b42101a1ef7902a9a433cbe7968dcad84692ada194128474debea1561a0

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