Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a70338eb47088b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 00:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92d0ff9a10b3c3a7faf7576d9bf9d261 SHA-1: c9c48daa104e46f20afc99a9e2ba6bccdc06b763 SHA-256: b8a70338eb47088b95781ac3517fa13be68284f791b7492ea62326923c4f1a45
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1598.003 URL Shortening

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms. Additionally, the document contains a callback phishing lure, prompting users to contact a phone number under the guise of billing or security issues. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://x-site.by/upload/editor/files/zumajisedixiliwetobavupe.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1c9dfc20---lexamakumefago.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/rezalojam.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/rewonagon.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/65667cf028fcd22c24341f2d236a77a7/xivosuwuzufilefigid.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/59880583447.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/nofokujumakagixoperi.pdfIn PDF document text
    • http://villkasz.hu/editor_up/rexugipokaga.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403ccd81204---ruterezemapofemites.pdfIn PDF document text
    • http://rayanchem.com/d/files/xaludaxagimimezopeni.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/tadabasoduz.pdfIn PDF document text
    • http://anm-av.de/uploads/files/40603723456.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/nedovupenab.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210913165713.pdfIn PDF document text
    • http://fructusartis.com/i/File/64694142919.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec123dcd20---27383970742.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xitudadu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fbc42f6d7526486c65970e22ac34547b/55330124652.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/88192498187.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/vusugaratugelopome.pdfIn PDF document text
    • http://schubert-hh.de/image/file/lesixuvuvefidawiwu.pdfIn PDF document text
    • http://jucal.es/images/file/zimumawenivomafoje.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f87872c7b---68798013679.pdfIn PDF document text
    • http://wsm.hk/images/files/57898413540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tubemate+pro+mod+apkPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 17544 bytes
SHA-256: fb070631e0bd29cdb2c5b42b446685e61903ddea9835a817bef6e4efff27f773
font_01_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 10440 bytes
SHA-256: f9376863eb8b765001f8cd9fc6b3a85b605cce8e5d50947f3d4f4cd1e78a50e3

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