Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b6c29d987936b7…

MALICIOUS

PDF

91.4 KB Created: 2021-08-20 00:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cedc2c8f43660f6bd16fa65d79c0a9d5 SHA-1: c720dd41426507f7454e26026cc0e048156ddb50 SHA-256: a4b6c29d987936b766da9eec95fd70cf44be49c9dc451ece14a6f9cc44d4e4f2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and a machine learning classifier, with heuristics indicating a payment redirection lure. The document contains numerous links to external PDFs hosted on compromised WordPress sites and disposable hosting, suggesting a phishing or credential harvesting attempt. No scripts were extracted, but the overall pattern points to a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gizaviation.com/uploads/files/kopug.pdf In PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/sujorodutuj.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rk9697cip1lc2ti0dairjel9qq/24005720598.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725f844efe9---wixikev.pdfIn PDF document text
    • http://efrex.cz/files/file/refibeb.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/84842258318.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cb06a1351---74598726631.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/navetavoxuxunumubivaxadil.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/namatadagobegixaxemuju.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a054b945525---38866320827.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/64135516645.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210703015346.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f2pk66lv969dl81c0onbfrpgje/dagurovaxoxuliv.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/gatokimolumigegumefuporiv.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16088efd6a809f---satigepemepukobiv.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3ad5166b1c2e49a30e60aa752a261af9/legevaduvi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/47209376931.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17fabeaad---91928910924.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/7492253839.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/19ae0cbff50bdbdac618618dcfc8e1a4/65320735225.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd87b48446---dizipexumazogulexunefela.pdfPDF link annotation
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/695655aad51ffb3ad9bd838cf0329398/siwivagetepivugobaziba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+short+story+the+lottery+aboutPDF 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_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 10448 bytes
SHA-256: e954a4278d5dd4a9dfbf8aa7b3db9f68a6d0f82719d68c5a937cd1bf612b32a7
font_02_sfnt_off0001314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 17180 bytes
SHA-256: 9e34a2c4c12d42449754cc2a71268711db66529dc32911c2a235845a165fe920