Malicious PDF — malware analysis report

Static analysis result for SHA-256 7942d8eba6da8332…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 20:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f72690137fd1c2f9808837492b5b97a SHA-1: 351b229c6daaf218a81ea778b6f30a5c4eae8bf4 SHA-256: 7942d8eba6da8332b82144ef1129828eac661887488d81d4761e1b76ae58c94d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, particularly those hosted on compromised sites, are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff4b3ad00---vomanedunitamepivupu.pdf In PDF document text
    • http://www.heksan.com.pl/file/gusidevu.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/kifakanunoletikaneb.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gobujozufad.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/65148160008.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355aa19f199---velamorivudobepimi.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/xewunipekokisizikonavuj.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161369caa2973e---6881411215.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/23126655005.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/64701904304.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/6997258684.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a353baa60c---vetazu.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109070056048803.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/gugopitiwebivetilakikeji.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb6d7fb98---32937452572.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/xafipimovajataraponeji.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/numeduz.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/20388307536.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/85925253124.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/lizidemaj.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/xawarimobukoxaviwivo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b9603033---puwegejagakogexafexezi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2d1dbf787dbf9604d7e7fa8fe6e0fa55/37933764936.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/57027025101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gta+advance+download+androidPDF 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_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 16268 bytes
SHA-256: b36e2af2bb4fb412dbc422bdf3f48b6f9bddf5cc88be767ef06741ea476178da
font_01_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 10384 bytes
SHA-256: fb831e897b7e65b5bf6cb9ef01bf72442b271c6574b05bdda0a2f3a35ec9038a
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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