Malicious PDF — malware analysis report

Static analysis result for SHA-256 3572a60bb7c02cb6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 17:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f812b49d9627b04b2b3db67b262eedc9 SHA-1: 0a5c2de2aefac0ea5de3eb0dc98f5531f5c9db1f SHA-256: 3572a60bb7c02cb6b20beb712f98d8b3d258d72bdedae4d350def2b34b71fcf2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a phishing lure for recovery secrets. The document contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. While no scripts were directly extracted, the PDF structure and embedded links indicate a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf95da1d306---99735126386.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160767f9c3acb5---38543877514.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d1a164814---3213151353.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/25124153822.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///11919709222.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/pavolevi.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/mimoxi.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/fb10363531abbeff7d6967b694a9731d/89082658885.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/63971723493.pdfIn PDF document text
    • http://altinay-law.com/images/file/13180029516.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75e4a026f---xagotetukizu.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/42292644913.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/1d07dbd10ec2ff365084117e7b551dae/15260116245.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e47474a8822fd08ea53fa841623ad83e/nomowabupejejewitozadi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d2fac96d---15687531988.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/jagegimemotikuf.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce66ad50f---nasobe.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/wajajaxuriwefazazan.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3652f21f08---88393016488.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/xijejeloxefikumakepopa.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf9b78bcf---30502001345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=digital+signature+certificate+request+form+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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 17952 bytes
SHA-256: 86aa97469f9edf6133dea4a0f32646d4ec1e4fa4a0cb5a4db13ee43e7b85e3c7
font_02_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 11212 bytes
SHA-256: 6a038d739baa875bb1c5cd0bdae498b66f763f202ba8fe26472e9b96ad87fb78

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