Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b32857c7fb6836…

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 08:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3294d1a61fd5c0619f352421747f02e6 SHA-1: 2fb74648e2e93ebf89a3aa8ca4743fee311d98a9 SHA-256: c9b32857c7fb68366aec1b596c6cd53d8a6b240b0e5edfff938dc7a3f4c1764f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. These URLs are likely intended to lure users into clicking them, potentially leading to further malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f96917b72---lizodemovusunikokekiw.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077c92c4e497---duxefit.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/zikekekalifizovubar.pdfIn PDF document text
    • https://irantruck.ir/data/file/15560958090.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3b5d7146---norezabewefopuvorakuta.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c735b25bfe3---65061843350.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dibuweri.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/jifapaganodixowuke.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13ba5a3356---tekelu.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/21303810742.pdfIn PDF document text
    • http://praguetransfer.com/files/file/93978979113.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/nrh6fmrqaumbofguu5nakr9qvm/84966695220.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/18ilm60cdm77fcto00sksvrfr2/nodevuxadam.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16112a1ced6071---80761467761.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996d2c8ca46---73782020136.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/29273836326.pdfIn PDF document text
    • http://gaudi.tw/upload/files/miperekupavesubapux.pdfIn PDF document text
    • http://asvpp.fr/pdf/33169985841.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/mataxipe.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5e5946790---70389110305.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3ec9b69e2---nevaferoporovekagu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b5286a5b9---rojuvozigesina.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/delifide.pdfIn PDF document text
    • http://metallpress.ru/files/29165603780.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/sozozuwakezupexiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tslprb+pc+syllabus+pdfPDF 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_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 16440 bytes
SHA-256: 4d210aa672b34c98a83e58319f5463f3948b821bbb94a633640105d3f045cfe7
font_01_sfnt_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 10384 bytes
SHA-256: bd43d029ca2b127b0434ad48a56d5d3639626162ee5da359e3416ccb579529fd
font_02_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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