Malicious PDF — malware analysis report

Static analysis result for SHA-256 caae1e54ff91392a…

MALICIOUS

PDF

82.7 KB Created: 2021-07-07 20:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef66af8e72d20272355ab388e1badb5e SHA-1: 262dc5a2aaf7cae128733953bd4b105a3fd8e4e6 SHA-256: caae1e54ff91392a6af0de059a49b124a7a96856582b4f0b812d84e75f96fa46
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are changes to payment or banking instructions. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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 http://asckhn.com/acskhn/userfiles/file/18327995695.pdf In PDF document text
    • http://hitecds.com/userfiles/file/lolevufado.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/16895982921.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/ziwifusigomafo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/hp5t1fi5vaf4avbofichmeea04/2690155836.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a804673a---natosizaxit.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1b57db44---pumefokusokigepizi.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/legedamobewupemumozekode.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/54248150030.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210702203801_sczcey.pdfIn PDF document text
    • http://freewest.at/pusika.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vewokapaxir.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/mavopaninumoji.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5440d78f---bifalodakojik.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd0b3c900---46159786180.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/fawexotagomavefusa.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/wevasinipobaj.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/mesetemejozad.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607818d65bd30---kolexanamidexujigerulij.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a3072927---20441742687.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tilakewujoloxipulikaxa.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/82889641142.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/99301794364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=where+to+use+was+and+were+in+a+sentencePDF 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_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10600 bytes
SHA-256: 7b9125fff862b5e25e08ac80b520e4db4fb81f489384ed1fca97c364a7822fc7
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 16992 bytes
SHA-256: 982763214a4246284801d39b5c337b5c8725c6a7d98f4e680779af652e639ff0
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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