Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3fc2831ae84f5b…

MALICIOUS

PDF

82.6 KB Created: 2021-07-04 14:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8c909a70a15b9d698661d6e47c33cb40 SHA-1: 61bb69784e9a291d2d514ca78e24c8ddce57ec1d SHA-256: bd3fc2831ae84f5bf6e63aa6790934955b68d23deaf8c46fe1fceb0f294efabf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user trust via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=minecraft+free+install+in+android PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/341c4cc3053c56bd84164d0c0ca581b8/fujepidopubemanamil.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a52c61834---58195135459.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3cbdpqn28n6g8li6ft713rjr55/salataxu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b669b090---41210635053.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842c1657fc---gofoxunufapi.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210531092030.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13aa4ab9a237edbbc8646cafaa10a754/gojalerunewe.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774821ebf4d---fapuxuj.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gopiwime.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/wofibetajajog.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8a827eda---4929142486.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2e0421eb---nivozifubene.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5f9b680a3727b45ec04b53d6bf2e0532/59170499115.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/47936294258.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/58343010748.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///38057704402.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f52b9e9c12---nudukob.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/pukeweponuzipemifuzajesaf.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/zamuzexelebixavatedew.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb30695676---berolopasexotoxipiroxe.pdfIn PDF document text
    • http://altinay-law.com/images/file/88596829294.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_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 16516 bytes
SHA-256: 57fc34f7abfe41572f040a5864b5156bb4bb24346fbb48ce4a645b0d6a67963c
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10460 bytes
SHA-256: c2abd86a66bc9b594cb44b14fd318ce8a1b74d9bc5feee20caade709ad23272a
font_02_sfnt_off00012545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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