Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c04d86cb0f7002e…

MALICIOUS

PDF

90.9 KB Created: 2021-08-06 13:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18a56956832ecc36883c3b779c047e37 SHA-1: 61b0d8dd6a9ad3c1c4244b395db2dc2b471ac10f SHA-256: 1c04d86cb0f7002e9e1fd67ff048a89cbd485f55483eef7f98a446a825f4d27f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into providing sensitive recovery secrets or private keys. While no scripts were directly extracted, the presence of numerous URLs, some pointing to compromised CMS uploads and link farms, suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://dpmceramiche.it/file/pubugefifujofirevupuf.pdf In PDF document text
    • https://hanomanberjaya.com/contents//files/43311150307.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/76021778146.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aac924a3---xojaruror.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210630044156_177703297.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c3badd9a7---jilowosifuniligowavimof.pdfIn PDF document text
    • http://turnyras.lt/Files/file/30923835556.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/310507113172.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/76214120839.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/79299234184.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d603de81---diwefovefoxenud.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/zisapegedu.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/wukopexokofepevekowobe.pdfIn PDF document text
    • http://cy2hand.com/userfiles/89614045790.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bba18f9dd---kalinobol.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/25a1cfce78b0736bd8c605ec5479e94a/78429332868.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/11pdj86km3gl9jnpdk5r0l7olv/17880600948.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/tewelepalogejidiwis.pdfIn PDF document text
    • http://atrsara.ir/resource/files/xuvopezilufitalu.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/18280070144.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/xapisivoxatinikoxuxe.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/79105464410.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4dacca003a---jeturokiva.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/13316164832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=object+oriented+programming+using+java+book+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_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 17552 bytes
SHA-256: 1aad6c1d474017d58ddfcd70f69c6146de039c741a179fb4c83a5d2b1aad5129
font_01_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14032 11472 bytes
SHA-256: 937f143b8dc5066e011db6777a07071047ff83d82dbbc2f0ae5600253d26120b

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