Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fe7bc2999ad788…

MALICIOUS

PDF

79.3 KB Created: 2021-07-21 03:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2e8208490338e838810f3c6c729526e SHA-1: 9d7fe5c1202636b5c343216babea854004e7e1d1 SHA-256: e3fe7bc2999ad788a2d470964c4fb7b71cd754a2e70fb702cbccc16585d1cb0a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and link farm heuristics suggests the primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f399a7f1ab---36883640399.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab776b7c980---58759915591.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/23393707385.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/oteaav01me9dcr8063v2f589mi/13688072462.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/93691566527.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc800b504---kazoxupadat.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210716_B394DF4E437E51BD.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a365020160d---vapudodubelan.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/170089264.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/sexobibabawazop.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/92349716141.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/galetaluti.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073004c50ecb---safif.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/23592541700.pdfIn PDF document text
    • http://esangsok.com/upfile/files/39363626996.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/95c13987b302f768d328ce763357508f/60322981050.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/buwatisita.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/30892866122.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wozejekefipuxotonokival.pdfIn PDF document text
    • http://qca.ch/userfiles/file/nudamagike.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210616_9D8D46776B08F3D3.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/jitilopawuladiw.pdfIn PDF document text
    • https://activepymes.com/pub/file/968296957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+office+bears+eat+beetsPDF 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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 16984 bytes
SHA-256: d7f2de0b3e95476751ed8a7b084d39bece095034ad7be6f3e52b34ea16adca3a
font_02_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 10388 bytes
SHA-256: e6eeeef7b753ef6d25e8377c30995b5335991057cee10a2d9afcfc7364a3d124

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