Malicious PDF — malware analysis report

Static analysis result for SHA-256 2162b6877b76af9c…

MALICIOUS

PDF

98.3 KB Created: 2021-09-06 00:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d4c12ae55129928d6910081af4f052c SHA-1: 841a89f1858044cb4ec5ef86210792fae217c9ff SHA-256: 2162b6877b76af9c7b9d3daaa57a4b4efb00f8a2b071f4dfcf30fb71e57a2e0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e112147e7e9---91095418290.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/53647610330.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/38910291827.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729de7c19c4---somoguwiwo.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/3312683579.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7d40b669---54717895768.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160872abb1e8cb---dobeluwasomezipole.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3138e93279---38542213027.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/mofevofikoji.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/xejukipudonabegozuxorafu.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/78759559734.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e59b32048---lemikapagojapa.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/8157795847.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/22469673529.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eadcccc68c03afd22acd024cfe977e9a/rapibewulugimivufixe.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/bufikovoxelevuweme.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db0b64066d4---4818810132.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/6524975663.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72e4d99e1---74988203589.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vaio2m49vfo0i24ssp9rpq2bu2/72830280979.pdfIn PDF document text
    • https://camelcarpet.org/d/files/vumefeju.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9b830c16cc1005deb7d2d37789eeb239/65161370127.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/08e603e0990f45552cce4c0b34fe4e5b/2684686017.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/35140001525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mental+arithmetic+2+answers+pdf+free+downloadPDF 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_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 20048 bytes
SHA-256: 6d54828f4c5b9d2189d712de0c8b14f398f30f2697a42d009b8928c651b022bc
font_01_sfnt_off00014909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16120 11084 bytes
SHA-256: 9db4b8118d6eef7c7ee76befe00a5e5e25509534f04edef252cb1baa09375de0