Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99e1bb070e0a714…

MALICIOUS

PDF

111.1 KB Created: 2021-07-18 07:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 561dcb14c9340f3db48e14e2270dcab2 SHA-1: de40bee415db086be93afe20051201684655a178 SHA-256: b99e1bb070e0a7149d28e4fff3df8d00e9c03966170d9f9eec541e0e3ae6845b
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and credential harvesting lure. The document's content, though heavily obfuscated, strongly suggests a pretext for requesting sensitive recovery secrets or private keys. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a malicious intent to distribute payloads or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/56ee23599fb1c31734e4e85aa802d9e1/venefubosofu.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c8272d679---nujezebusaxudekevamaxisuj.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v02sh3p0a4fp6v7o3d3giudbak/58945185212.pdfIn PDF document text
    • http://kelvista.lt/images/files/77249640071.pdfIn PDF document text
    • http://614move.com/clients/4890/File/pubopuvu.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hsseu6jk7pnuvncssmh4h6h0o4/pudanotisizukubu.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/gesomoxuvog.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/xopizitesiduxinilukev.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7c82dcc7a9af67b0909ec2b9db8aa8ef/memipope.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609236540990f---45167540468.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f7932593fc0fed4345acc0b51a5cdea1/tixomapinaxesekokozetuwa.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5299152a4---ruxikijodugub.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hbg245pe1oqegvl5l88dm7nqn5/telen.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/jijiketif.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab7ba138b---susodufatepi.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/mosexifopenuf.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/lotijilogabisegijuf.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/89uf7g93f1qfmnu9po2mtdhgn1/samiwetif.pdfIn PDF document text
    • https://mollis.rs//files/revaduzafusuxubilugazes.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607de11fbd95b---gefegurenakulul.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78d680e6f2---93164192752.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/lebiwatosed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bouncy+castle+encryptionPDF 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_off00014f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7F 10636 bytes
SHA-256: 74c10e0b3d196f2e1d55b64a6ff233c61178e66a4d9827ae6aca96392e8c9093
font_01_sfnt_off00016811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18023 18020 bytes
SHA-256: c64dbe3961e8edb3add134ba9e41813dc884f529cf0c3d8f059a89e0db8f8d7c

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