Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a9f3dbe2aa4cd5…

MALICIOUS

PDF

91.0 KB Created: 2021-08-09 10:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b8e9a16382f5fa940a3f409cbc396d9b SHA-1: 9437e884590427f35c89e3e533aeeb7718aa4c48 SHA-256: a0a9f3dbe2aa4cd5238d0d64d9196a31be188e48816a1c36408c436c04645914
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It employs a link farm strategy, distributing malicious PDF files through compromised WordPress sites, likely to lure victims with deceptive content related to invoices or payments. The embedded URLs suggest an attempt to redirect users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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 https://garglob.ru/uplcv?utm_term=how+to+get+free+imvu+credits+without+downloading+anything PDF link annotation
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/raoustss1p96vio0smrvs3sfu5/lorago.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/0b919a1911c906e1f7deddbd83ea91af/pivutori.pdfIn PDF document text
    • https://samowar.me/userfiles/files/23615256203.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ad13ea907---94024430099.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/62097160675.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/dalop.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/b4hldaoggkao0hdakmaq61bc12/60876585097.pdfIn PDF document text
    • http://nensi.si/upload/file/xozujuwel.pdfIn PDF document text
    • http://w-mill.jp/images/file/89390717861.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22414d220---89505579531.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/xidemow.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/75759325961.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2435573acd---85327521027.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4b5cdc8f68799984dd02edacd34a68ef/falot.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/wavodoguxumu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f358efd8bc6---nusasesotonapomotisu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac81b8a5f---wakipovozozivufazakebug.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160735a4242a99---34595493338.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/46782843181.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/76865448288.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/sifovevakubamo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e5ea18b0---28344866958.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/62170896256.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/mijafinogoladem.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_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 17068 bytes
SHA-256: a4270101010a267451237c9630af9d1b06405405492702e3e9dbacb286dc5316
font_02_sfnt_off000142c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C0 11280 bytes
SHA-256: fae80de933c8e39402e52c38ef434cd614d2cb9a304ccf2e48f3de73a6924329