Malicious PDF — malware analysis report

Static analysis result for SHA-256 d099b3557fc9bdd3…

MALICIOUS

PDF

87.9 KB Created: 2021-09-20 06:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 970106019f5697e3059986aa849e1e9d SHA-1: 954c3fa8f4c85b2a6d9cf220c47a447f84159a7c SHA-256: d099b3557fc9bdd3d25b46dd1010f9d8e8157086f33da5cf30a137445e1545dc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The presence of invoice-related language further supports a phishing or scamming motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161370b07290b3---53537742237.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140670147252---48218063361.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/lomaz.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/14924665753.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d4f0c7044---nuridu.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/3073474465.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2f198c14---gurodidawemijux.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368f29ebe14---bimowutabofema.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/12779218572.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/kemenevokaniv.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/kunosebufatadulexop.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/29417273289.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/19277082545.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/74168352623.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/28040628920.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091312570473499.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/zomesirorejifotetofigisof.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/14826658830.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/nexaraxixulipirufuti.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/855b45cab463528cf8b897255eecc75e/77307722672.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/puzadadiboka.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/78140162625.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/bawepiturizinojofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ba+micro+merchant+apkPDF 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_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 10568 bytes
SHA-256: 7e25d8edc111974754e2bbf47aa098eb3e389d3b452434311f788525cdded0d6
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 19652 bytes
SHA-256: 1b673626efcb5a0ae02b245eedf9c13ca2da08cf8b5f65542580c56f9a179f67

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