Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9689fad4cbb4e5…

MALICIOUS

PDF

96.9 KB Created: 2021-07-14 00:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fce3aaebc9529c64e5d50b4a7fe4275a SHA-1: 36c2d5c97885f062d85019a0fe8dbcb8fcc67fd6 SHA-256: 5e9689fad4cbb4e55c0805b7f56528648396532391e523ace8688f3c7123ec6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/tikoba.pdf In PDF document text
    • http://tencanpowder.com/d/files/wezulizowowumazop.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/40015604561.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1d9955843---zalapusil.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede641a44ee---51860505519.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa48446b3---litunadilazemipomuxej.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/b03vr7eb2f1kqg3l53begis0pv/82204473020.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/nibimew.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a935d9899a9e62e6d06a175826dfcc46/vezizun.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/nikaxadoboboxadisidibuxu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fs9ehq0g5ibfb92qlge1373nkt/powalufuwubawerarolezedu.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/45408186195.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107080915228266.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb87c7fa84---74384646661.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609485e9d2c0d---penokabepojumebelopagateg.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/43716250589.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8f881091d---98314300964.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-19/20210619051644935186.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160915a0e2c9c9---22246726144.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/gikobog.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/12148724554.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160983fc6a0081---nizinimuwaxilin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e283d6a478e---81879884947.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/fedobotodofe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pn45mnpa3vdfi541d4q4cgr8ou/3501935220.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707427f2cf3---73071386498.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7be222b0c2ad2a115040c9f928011f7a/wadeselatefakisozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=important+quotes+from+lord+of+the+flies+chapter+2PDF 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_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5B 11200 bytes
SHA-256: 8e77d01b7ebd5d0b94c3069d24e46509178d92c8e71bba453c5241be58b20b85
font_02_sfnt_off00014729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14729 17812 bytes
SHA-256: 4de22dd0af9ebcd9276c14ceb7616004fa31bb652a158b96224402c3ed4c391e

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