Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f41a9af1cf98fb…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 06:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c00f7fd99fa0b680c6d00ce2c88a4143 SHA-1: 3082ef24eba62d80aa21779ce4e8417231cf4d6b SHA-256: 25f41a9af1cf98fbaaf1185498c87ddbe2f4ad0e6145c6b1c8606b742e9d43aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c908e611af3---72293159813.pdf In PDF document text
    • http://cpghollywood.com/userfiles/files/30562678395.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5df0517b25---murudulutoni.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/814e0b65388186fb985938dff839f6cd/turefipa.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/79892840987.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e369f0088040460ad3ddca5705e95549/worovakodufolo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/56939881956.pdfIn PDF document text
    • https://network-italia.com/file/93942973553.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/65441559387.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/vidutegixe.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/kakom.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2dc0dd07f---24908888508.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/22913860832.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/57705526916.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/13204253792.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcd23d6df---ziriripomatikoko.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/m7r8gop57hnsqjvsg3jtsdif1i/napotidamidavesudepe.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5cd73cb131254ee62b3b55984e9aa481/70056120316.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11848ae8ba---93786596803.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/67698445572.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/surewogeraxa.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba007d6152---7175119152.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af7804a97---zadimajufevizotobedi.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ioo79lnun8ape886bfjoodoanj/sekolupem.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3fkupj9vqnftoiakjase15j55u/sotabaxisor.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/82468423321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=2014+chrysler+town+and+country+dvd+player+manualPDF 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_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 17184 bytes
SHA-256: b2472eb0fe3d0737ed42d46b6a81bbf05f33314e20e5c5ef527eaecbec55c1f2
font_02_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 11328 bytes
SHA-256: 328f32a7fad1541f25013bce75ba7f2927e421fa0a028357d186585de53c7369