Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8484d40ac30659f…

MALICIOUS

PDF

90.9 KB Created: 2021-07-20 06:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2fab6a678cd8962df0b0de1f9649af8f SHA-1: 0923b289de9d67331a80e26803eec052e07baefd SHA-256: e8484d40ac30659f1a0572f16bb5ac8122c3fef795e19516f481586a09a7054a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading additional payloads. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • 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 https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607823214b10c---72125357493.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/780a83cc0b758dde80330d0dbaab0f90/rukarobepizafe.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e823d66e64---xujefofubod.pdfIn PDF document text
    • https://isosklo.cz./uploads/nikos.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/musewatuvarotopuxi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/23007737560.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/sukupubeg.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/29429728000.pdfIn PDF document text
    • https://everestart.com/images/stories/file/60726677652.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/59424299671.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/biradakiwovuzewutid.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5945cde451---76429126780.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/285smuvoa4639tqfpkut19o2ft/84311376458.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/37582805681.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/80662870470.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a4e45841---liguzo.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/dakozekikoteruvo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160845c211fd8c---8971086356.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/bopetasuzikobeleg.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/63097607486.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/e6ak88gpjtk2r4gqsltsvj0172/98441544236.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///56873467990.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094d57cac0f8---zuniwe.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/au2a24u8ot869hb7nv3tof3q84/54442360067.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5d61d5836a183e3e66b7f4b6366c044f/27517950208.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d646ba3e02---37518303996.pdfIn PDF document text
    • https://zzhqhi.com/d/files/vonusumepotumekaruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bank+po+maths+questionsPDF 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_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 19108 bytes
SHA-256: d432b5248d72e45142d85bb7da8c40bf513f01ad04d0b4d2b82d0287507676b2
font_01_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14583 10764 bytes
SHA-256: 4010836b15e15cb9c7bdb01b2dc8dade97fa6209845ae5f03ddac7dff3bdd299