Malicious PDF — malware analysis report

Static analysis result for SHA-256 2256492c68ca5a99…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 23:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b0d714f1685d2af3537e5d3ebfa85283 SHA-1: 23bb28a3030955b36f8423a11dc42900d24ebe7c SHA-256: 2256492c68ca5a99e3943806d3b6e979aee92dd40afa6040a66bb45b2ad08cfc
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or uses social engineering. The presence of numerous links pointing to compromised CMS upload storage and disposable hosting suggests a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://acecaalcoy.com/userfiles/file/14802270744.pdf In PDF document text
    • http://telekommarketing.com/firme_data/files/laxebadutosafijijeget.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/losalisa.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098e2aa03878---rorugoruwefomokonuvimed.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210622165358_m2ioom.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/kiwipedusixebisurimet.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/77955059285.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wosad.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f95c1df01---94057930753.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/18535041775.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/60949516813.pdfIn PDF document text
    • https://ancoraeducacion.com/images/47825030534.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/66377504937.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/903670007.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f6912fe5---godavejetewaruresonawotuf.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kuxom.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/n82u5g8vq64krbha5dm9e5t52l/88637473679.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/rr5d0k6rebsgntmgpnf0i8nob2/32992791745.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/doseze.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/33587129205.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///51702305797.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/cusa0p6ko4e95pd5d524a8n5em/66474825755.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/sedebemu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a230547bbf71591b58a5599d47a47789/12274128681.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38dfa1d89c---95636163197.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5740e3657---mazexadipama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=actividades+cocurriculares+pdfPDF 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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 10656 bytes
SHA-256: 79da3f08227484e041c52e5513650dc8e73c2576ac96f2457741d59dc8cde5a7
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 18788 bytes
SHA-256: e82d02e6050da72668a9ee14e1c7a04b47215484d7b9f744ad7906260e14b21d

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