Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fc48f007f9e788…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 02:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16d0a79e638fcd2ee399e10dcaaf0e88 SHA-1: e785cedff88431458d1e17a5521665a994361a04 SHA-256: e2fc48f007f9e7880d322428efc999ef7dcc04a489a76764ca54f59b57efda17
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery secrets like private keys or backup codes. Numerous URLs are embedded, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing campaign designed to harvest credentials or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=connectbot+ssh+key PDF link annotation
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/77789701820.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/buxulewadabugases.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/11506294733.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad8b73b14---66254866819.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/86029220917.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/52591825671.pdfIn PDF document text
    • http://htwy.com/upload/file/samadokizaruvovumafujev.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/26191664552.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/33133036612.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/gigivur.pdfIn PDF document text
    • http://boki.hu/editor_up/16390792738.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/20414448812.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/87325531556.pdfIn PDF document text
    • http://www.centralperdana.com/file/43474036257.pdfIn PDF document text
    • https://servicepapik.ro/files/berosatoxexedu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161425c75472a6---27952499087.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/difetarekago.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1283e5ab---71914882440.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/rexerewelunodipefewugoku.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/wipoxoxelol.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/97423312001.pdfIn PDF document text
    • https://nls.vn/upload/files/lujefolipejapafazun.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/pitiwi.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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 10304 bytes
SHA-256: 4e885c3748d0f2dd458efad400d5351986848fcbde2bea6a51c9a10d34214157
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 19112 bytes
SHA-256: 7b0c16088eaca10af5bc1194378c393103b5bf90d722910c8f01b362ca411743

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