Malicious PDF — malware analysis report

Static analysis result for SHA-256 102de53d03c39c61…

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 20:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6518b3ad880a8bbb054bcaddac7c0c63 SHA-1: a86b775baff308e94b3b5ad15faa6041810fbdc2 SHA-256: 102de53d03c39c61eb526945b4883850009b606aa468d5c9b9eb601ea2c85f5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb40724dec---lebewajekogabaxeboxit.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/37545571112.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/tanulorolusezomaxu.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/papodenubufu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1bc1b6df---dujilivolu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90cc23c15---dolenepaj.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/6480664928.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/naqbhbmmck2qq5div5a7at8lfq/90089797410.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/xisaj.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/22255534504.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/73524785043.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/bupegodufetefugudomin.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6d2b9fed234c1141be990c82059c6b17/zabumekugoxuguvele.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8059042252.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41120923758.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/tadalitufurakifimaso.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a90a060c---89888076906.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8440d56b8419d9878f22d9ed18651879/mutulukotarujiferu.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/89284926177.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c432119a88---zatopegibazubas.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/73408ca3ca7082c2271f2b34e896c72f/xomused.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/52847534526.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/7a4d331e53aaafe960dd662e27ece0d8/sonewesom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pmi+acp+exam+prep+second+edition+free+pdf+downloadPDF 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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 17172 bytes
SHA-256: ca5eb672461ee446d750d93ad3d088b8cbb5882a7e3dd6c503ffbe160d36d80a
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 10968 bytes
SHA-256: c0605775fa113730d3493cb8df270ac23068e3833edb707387daa5c52fc920fb

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