Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c9904c2556a4f1…

MALICIOUS

PDF

83.7 KB Created: 2021-06-28 00:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7cb04fa69033da10f57630753d79205b SHA-1: 28529bdfdd248f6412cc38236d62941efae636b3 SHA-256: e7c9904c2556a4f1383b23590895084a0d6f727da2a4b621d196d95c56880aad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting it's used to distribute phishing content or further malware. The PDF structure and embedded links are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://oniceh.ru/uplcv?utm_term=table+of+integrals+series+and+products PDF link annotation
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/tlsscamq5abhmqf9bqfcpri766/davakalawisixo.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/923ac6d29ef8c4c7933a906a9d7d7a4b/muxefogog.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/jidijoxewasarasitixosaxan.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac252f2667---57382660985.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4f56843e431c8037dfc743002497b27/jogigixibemosevumifi.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/janenopudo.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/jukapowiwe.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ioh0ctjf3u7f89m8n9c9ek728b/riworuma.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1846b0e34---sijufajinuxaparona.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/38a79215f8edd9e23b99feb9efe2124a/sujamesu.pdfIn PDF document text
    • http://kelvista.lt/images/files/giparowufezikewet.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/jubumamasino.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d4c503bee0ac07d072d8f4d3d14337c4/94651953862.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f183676a---79717832095.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/pawojokakitawer.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf11811abb---8104100850.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a24e1152---55783529577.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076001520643---69565407174.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0fff28731---vebexagof.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/koripine.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/tadaxodu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609badb6256a2---ziboranomunolafagorege.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160972acfdda08---45556617038.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/70036773085.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f02aca900---92539993610.pdfIn PDF document text
    • https://ivanamihic.com//files/pufodugobola.pdfIn PDF document text
    • 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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 17676 bytes
SHA-256: 01dd5c3730233f290b34d1def492ebd881d3fce6c2bb398f3c491547ff650030
font_01_sfnt_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 10996 bytes
SHA-256: 549cd0a560eadf985c54f874ba0857f474aa308b6b880d90713449f3d92994c7
font_02_sfnt_off00012931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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