Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e525f3a28037d5…

MALICIOUS

PDF

89.7 KB Created: 2021-08-23 13:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41590c1aa4f98b7764bd0e95a49e93ae SHA-1: 54d197f8c9707dd48afebd7989c15e7903e9f4af SHA-256: 35e525f3a28037d57655306fa45bf0be40ca3e8d6a9f55cbf05cb85e6d9e3e7e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution suggest a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8aaf3cb2f---puladon.pdf In PDF document text
    • https://purefeeling8.com/data/file/68256638326.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/hb38ljnd6ign6od4fd4tbv2nt2/32792779011.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/80133247644.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/kusuxezakiwemizuwifazev.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217141358457507.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wufomitogagageleninerel.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66506700587.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6f39e3df08317dfc70dccc4706733c89/12871469933.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c386232475---7878335475.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/bowokun.pdfIn PDF document text
    • http://akademibt.com/resimler/files/91017911749.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/gimuwazivozulef.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/tibulufojifekinumadu.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/dadajakujipazirana.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210819093314993.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/1944310776.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0bb886b02---wimepup.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b849d9b0a3d---kunulanevurabagapo.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/fuzofikajubet.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/894225329260f88e184d3f49df6aa553/nuwelemovesobubow.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/69249da5d169a66ab45df1b093497747/85778656729.pdfIn PDF document text
    • https://adium.ru/userfiles/file/49898311913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bourgeois+values+definitionPDF 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_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 17340 bytes
SHA-256: 84a8d2d1e58573ec8db1b2f4f493a84290e1cd1ee5fbb1cb9e82ffca505c146f
font_01_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 10748 bytes
SHA-256: c1ec5fe90ed68e24877852d6e96005e334c556a0dae8c8de51681c88a8ac4d72
font_02_sfnt_off00013ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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