Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c17d72688097c6e…

MALICIOUS

PDF

93.8 KB Created: 2021-07-20 13:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 036573c7d59c831baede87d5a29fc73b SHA-1: f31d3f74606852eb71e5f376d17940f2c22d9689 SHA-256: 5c17d72688097c6e2ec15dae3766eceefcfdcea9f1722ae73f8354a6b97820cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://accu-split.com/userfiles/files/51554124339.pdf In PDF document text
    • http://aucoindeshalles.com/menu/file/bojodowototepejabore.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/qihj4l9nufeqo307jtq63uee34/puxinedazoxigaba.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/26386283163.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/78fij0s6hchhviqicn3odfr1p2/68127130768.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/68s5sdtn7o9hjetsfri4gqf4c6/93547816297.pdfIn PDF document text
    • http://jaatkinson.com/userimages/99803188453.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/38678383343.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/okqugqvflf7t78eh341vjd2hnp/83575462074.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/biwarirozef.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d96e8e0b9d---jupatifozigemirigono.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/42599644195.pdfIn PDF document text
    • https://topupdana.com/contents//files/fubefasako.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tudinivizavupibitetuzase.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e32d13d1515877030f42a1304ba71559/zutetonuzaxisoxisovepa.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d6d2b9d7---binitejibatum.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/upj1cb6mqar7a1lvbh56p5uvkl/11667474133.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0f2ae972ceef5fc2ef824970e9a5b994/saxabavabezidulowuw.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/mlkml90ppmskr4o910t8qp80va/65993115316.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/72eb0bf26a19afd2c0abee90f43df438/boremagigadotova.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/xilitulejozereta.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2824732bfe---rigowokofimofupowixawebe.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a38c6e8cdf2d621331ad870bf45a7752/guworesinawajipunagodozu.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/692efffad867ed09d936c933d9f6bc82/nusapesipugozeduzugirilis.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/90057652757.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9lb4qsvvmoeefupofsv2bdip70/kotaparadalawaxowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=poem+comprehension+for+grade+3+with+questions+and+answers+pdfPDF 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_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 16964 bytes
SHA-256: d70d73642b4d52a26ce2d5f91496eaed50f8c5d1bdf71a66ff1d2895d5c3a789
font_01_sfnt_off0001368f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA6 11528 bytes
SHA-256: a875b0fc34b479dd0dc40f5a6fe9eb5ccb3f2c7c710310b95627b06036336dce

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