Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef0cce6ef556a07…

MALICIOUS

PDF

74.8 KB Created: 2021-06-29 00:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a66d0d98edd41c3a130a0b4cb749c20f SHA-1: e0d8f7e8dbe089939dafe73a1e365b77fb6d4a30 SHA-256: 7ef0cce6ef556a07a7a466a1afb8a5fb6605e4c31e6ab77156d59718ca4e3ec6
236 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to malicious content, specifically identified as a payment redirection lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to compromised CMS uploads and disposable hosting, further supporting the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://ltssinternational.com/res/wysiwyg/file/61188683647.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/281089363972ba3ecc5f05c425e9ab0b/jidobikajajijufuja.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/sewukotokesuzemisofaludop.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/1ku2vp1h317duf74o64r3lg3mc/63748393200.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/75082405621.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/kidew.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/vefuzunibupiwodulok.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/japituwuwuweronu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/de12888155f19b918d6e2d79f52f9692/36628818861.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210625181226.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87e5dbc8b---9579318110.pdfIn PDF document text
    • http://amrapalispot.com/userfiles/file/72970635687.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2837ae6fd---zojoxe.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd8c148ed---nejerodezalobiga.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5ff35a73---remudip.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b482e6c52ee3f210a359b9bb1efb11fa/vigupelanigutuzoloxob.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/dekale.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/sejelesuxe.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fbd334fc8e13047f3274ffffcd9763ac/jexumezosagakava.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb39b65d8f7---nugatatujipere.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836b5c7e008---5623909025.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6eb6c8c87fec9146accc7d55f3d6f387/zaramiwem.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070490c33671---88360084421.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/48490518038.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68d71e670---sowijekuralemarazogisaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pay+my+taxes+onlinePDF 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_off0000c4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 10388 bytes
SHA-256: 7d3f7223480a21a139c83a0a766b5350d251cbc218328c00132d393858f5198b
font_02_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 16276 bytes
SHA-256: ef918056b3da8f293e0b84112600f1f1b863dadd0ed840fcb389647fec4ab22f

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