Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc14f245289b768…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 19:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 675acfa3088850af9635f783f1991f20 SHA-1: 52a0996516dfc1101dcdb700ff04d00e2de08560 SHA-256: fbc14f245289b7687cd12b97807c7259366d5e3b484364e5f2e5fc899fb3d9ea
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to various compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the ML classifier output further support the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yyfxsw.com/upload/files/92954299811.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161381b95f2d3d---25443945073.pdfIn PDF document text
    • http://quranday.org/userfiles/file/68809386836.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/dipumufezot.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/66574101829.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/pazelaruxudavan.pdfIn PDF document text
    • https://venus-forever.com/image/files/jezuxewigomutimakape.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tinal.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161350d47700f9---salitowulexapuzuwigojedex.pdfIn PDF document text
    • http://alkanboya.com/files/file///kiteweberatazezuri.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nojuwelagajagetifom.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5ceaf5a4---31287101101.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/nonanurafabekivarapit.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137877abef7e---14181654537.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/vulowakofakigaviki.pdfIn PDF document text
    • https://bnovum.hu/downloads/daxugafojejikada.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/6727738922.pdfIn PDF document text
    • https://network-italia.it/file/96171774078.pdfIn PDF document text
    • https://bfull.ru/uploads/files/43805187415.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b21975ff---dubifabujitotariro.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/32047732945.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210904_419E14C693532F0C.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=beyblade+burst+app+codes+valtryek+v5PDF 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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 20388 bytes
SHA-256: ad0a93c53dd1d962427281685cb22cfe17e4065dbee46f84d305ce25f2f550c6
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 11008 bytes
SHA-256: 49fcb3f09045ded9ba7010c2e90043e75d717ce6a5c4837cde2557518a457c31

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