Malicious PDF — malware analysis report

Static analysis result for SHA-256 354270b08dc459b4…

MALICIOUS

PDF

84.8 KB Created: 2021-08-03 01:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 1f0811dccacd81664dc5d87342f54092 SHA-1: 6d67fc6c3d43d1739fec343b2aff28f84ba6162f SHA-256: 354270b08dc459b4ab1ab8bc36bdff5924374c8d399d8a42714377f73133fdeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=cuento+de+los+tres+cochinitos+y+el+lobo+pdf PDF link annotation
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dukrn8lm7olmng3h2ad9itte88/90370853251.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/sulez.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076743600f1a---65364615243.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7e6acc4233a07a054e8cd7866a65916a/91696832400.pdfIn PDF document text
    • https://khanikango.in/file/dedugegewogazab.pdfIn PDF document text
    • http://chongros.com/userData/board/file/vomafaposefirirexavuz.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/rijowofovibovunabapik.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/43043353868.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/69185630832.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/95842127506.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2fa6540c1---tapikalapu.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/47587013967.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qdj25f780o8kr5uei9ra0irmat/17565346988.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817f1d1367a---69610692982.pdfIn PDF document text
    • http://fotossc.pl/_files/file/wuvukaroz.pdfIn PDF document text
    • https://songhong.info/userfiles/file/doranusavobesotegasupok.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/664c2d94b1d7a5322fcccb7193ee5488/60423883141.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c2204cff---gaxebuzem.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d66f13b4041b81ed0020a77d9157e3b4/tenol.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/gigolon.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/pafesirubaponed.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/nisukujijoji.pdfIn PDF document text
    • http://alkanboya.com/files/file///39159646202.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/99e9a1dacfa8dfa9bef64b28334b2f34/14446705757.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_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 10940 bytes
SHA-256: 93383a174ec96a4b83b2083d92cd6ef0dafd6e12888fc430116d110f0dc18c92
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 17632 bytes
SHA-256: 2f454b0e4e73f8d5dbd43cbe1198dd78b798f0032045cc14e7dbc00b843ce1ca
font_02_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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