Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e3dbc25abbc0df…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 11:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87e4cbe4759c69076fb6d6c15776ce61 SHA-1: 95b97f45cd5cb29acd9fa4230d0c18d0de7e3e35 SHA-256: 38e3dbc25abbc0dffbb3afd26f8a92ea3511c20fd01a9906c872186efee4f146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm heuristic indicates the primary goal is to drive traffic to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://headrepublic.pl/images/files/naxurusagef.pdf In PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/87881122910.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/55003272678.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146e2b6ac778---27930624050.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8ac5d609---fezusadiput.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/gujeti.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d4776c2d---binapus.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/dawozofum.pdfIn PDF document text
    • http://unityproductions.com/upload/files/88941045453.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/19168695078.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210919_0DC37C752449A86B.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/19703454644.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/tewafusafunudadetiboti.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144415ab78dd---nuzemi.pdfIn PDF document text
    • http://edituj.cz/res/file/95656120357.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/kuborefipir.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134e313f39d5---tabiropufenutekanotevepev.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/nejozazagimudel.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464a88b37a9---37447849723.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/nudebozewufakoxex.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/sowozosotefavu.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tovumopukida.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/43241501910.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/lamofaguwoketebusosa.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/movaxuruxipobanana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=grammar+book+for+class+2+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_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 19424 bytes
SHA-256: b4f4f34ebdd029b69941e1107cb741395b61a54dc8492c761e68627fa417539e
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 10748 bytes
SHA-256: 209fb2e6279f44349c47661435fa993358f8fd8e6a34c121ed854a34293247ee