Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e48ad13b0ea710…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 21:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb0c0b90d912b7d6d070930e85985486 SHA-1: c3662fcbb387f23086d3eae3584155a17a8fd719 SHA-256: a3e48ad13b0ea710ea4861f6866fb61a26123935954cc0a51edfccfd4843c55c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://pistant.ru/uplcv?utm_term=susan+colley+vector+calculus PDF link annotation
    • https://rivieresoceanie.com/ckfinder/userfiles/files/toritizife.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d9232f4b---91178837471.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/mizeveneko.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/92931187655.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/fopovupu.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/56269669226.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/21528959413.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e8d3267aad7d92a347e8b4d940dd9e3d/waxavutegelenumokigu.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/difuvukudugizukebofulazop.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614249a51377c---gevaziki.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ead2478573ee42d2221feb8b44f7b7a5/luzotanurop.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/tutag.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613921bdb1c25---66728602924.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/75827266160.pdfIn PDF document text
    • https://ibericadearmerias.com/file/tuxugebipefugopepuko.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/20334183521.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/78510447448.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/93712629813.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/60010170096.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/17738648542.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210906175417.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/74979294159.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/30192807836.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/65848867047.pdfIn PDF document text
    • https://ewt.cz/res/file/75288951719.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145525e96dab---mozuturukane.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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 15808 bytes
SHA-256: 72e5c1f308636bea5d5b078ce12a2628dae42fda3dad20a3b19188fae927b7d6
font_01_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10484 bytes
SHA-256: f33e5eee91f6af3668fbf0201aae8c8f35d18727bf522a716373c8e75a6e92b2

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