Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ef12820106e910…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 04:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26508b98e1d332b45e66e726bfbe98ce SHA-1: 3403c518d72b6bbc11a4d216719fc22a24774ef8 SHA-256: 97ef12820106e910487006ef210df22900c366121d6ac05b1accd8572105729a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external websites, some hosted on compromised CMS platforms. The primary attack pattern involves directing users to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/76544877885.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/662c8612873eb1f03fcfc9c20414b7d1/rarokudonebulegitol.pdfIn PDF document text
    • https://tmtteks.com/files/fixijakamazivenalowad.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609620f6c0571---lenosuj.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/97604500307.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ad4687cca---wejadov.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845f5ede207---52236840239.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/6573904743.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/depabigerezotix.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887af378276---87015492152.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608280e148b6d---kozavijonefa.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/10747735377.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/debuxozorumawejujirake.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781134e104e---42207141339.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/64836517081.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbdfab82b3---53043367561.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/kivokirojipesesad.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/85858329697.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/65204d175e49f88dc3ded958f6c70ea3/doxemizidazus.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/26343662312.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/furazorutidukurodapexoko.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/zilazojozadunuzid.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4e694fd0bfb9879d6f1076d56ef8a0e7/18628142535.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vinoroxerepenavituzutuwab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+king+of+fighters+2002+plus+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_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 18236 bytes
SHA-256: b6623cbdea0b1b7bf7c0245e3782ef6b95f2d743a3c012684cbc01410fd1229f
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 11036 bytes
SHA-256: 21a87f812d4436e1a265b3ef5d399c0489a8147a387a3c88be64ab1f5f1d1727
font_02_sfnt_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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