Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27e6d12914ecba0…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 13:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5d6de453288c2dd04907f41d0a3af5a SHA-1: dd72e3952e2b3e5686781bec63d1feabb105145e SHA-256: e27e6d12914ecba05258648f0e1505a7c3e97e9678a98c11e9de2f3f26be5048
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ventiliatoriai.lt/js/ckfinder/userfiles/files/moranirupusuvemoxesofub.pdf In PDF document text
    • http://liubeauty.com/luutru/files/jowuvozomikodek.pdfIn PDF document text
    • https://led7.ru/file/87231258112.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/begigoxavuxojej.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf3579805---38788989588.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcb30f919---24221170246.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/bps80s549oq79u3ej3vka4o6pi/98118906558.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/49569211653.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089370f4388c---45263304265.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/pirejurepaluz.pdfIn PDF document text
    • https://banghenails.com/upload/file/51218028948.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f759816f---fodiwepofalisijawe.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/t35js637sur9akcn8krr3vqdop/55658287065.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d0664f3a---zasitapodudalavezenumup.pdfIn PDF document text
    • http://coffee33.ru/archive/file/89899666159.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/lafuniligiximozedijugis.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b2gmr6hat3qbtn0larmirmu8b4/rogatilurubozigimof.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/54057324359.pdfIn PDF document text
    • http://championsview.net/userimages/61066477482.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160984213a2d35---nidegisawojamawotub.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/84882236848.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/75527340685.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d3bcecb76cf1e8212832f02acc0f29f5/34674418816.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210618090532_gghm0t.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/mibivedixetuzadazu.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/govipadoramiwimifotewida.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef370d7a75---bubejel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=stochastic+oscillator+for+intraday+trading+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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 16708 bytes
SHA-256: dc1beb522ef4ff5eb378928056ae6abe0bd65ba33a1c936335fb713af73c7f8f
font_02_sfnt_off0001272f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 10956 bytes
SHA-256: db6129cec99a87f3d920da04e443cd5cc9191a4dfbd50ef786404fc715566fac

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