Malicious PDF — malware analysis report

Static analysis result for SHA-256 833be5d571038457…

MALICIOUS

PDF

206.1 KB Created: 2021-07-08 02:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 198ce00564bbf0ebf4049de7ae8854b6 SHA-1: 708b8d780f3a0a61a51bed86cce5dcd5e56f77d5 SHA-256: 833be5d571038457b4bb2ad69617e740fbef04f90a019e87422d105a397d49aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick users into downloading it under the guise of an invoice or payment request. The presence of numerous links pointing to compromised WordPress upload directories further supports a phishing or malware distribution scheme. No scripts were extracted from this sample, but the overall structure and heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9509

Heuristics 6

  • 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.
  • 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://ghalemdi.com/userfiles/file/15502184716.pdf In PDF document text
    • http://biomisszio.hu/tmp/29605950409.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0e29353747ff41ba6d192d2351b34c3a/13678390266.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cbc983e8a97cbbca6926ca40b1c156f4/2910575276.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8f695ad993118c18a7c1ff2e4a44bb70/12249674745.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/41bcfb804af21f957a7b8134845854bd/32042777374.pdfIn PDF document text
    • http://xigmatek.com/upload/files/13825792444.pdfIn PDF document text
    • http://altinay-law.com/images/file/sigorisarikubujuleja.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/33131841642.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1fec81f98c2513853e29620dca8b4f15/46906905129.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6534ca1cf---9036539861.pdfIn PDF document text
    • https://capecoralliving.com/media/file/37107696224.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/puxogokelijijurusuva.pdfIn PDF document text
    • https://magerp.org/upload/files/98770841997.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/nirifemoporuvan.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f5fa1b20e1573068afc87fb19f5227e8/54557311481.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608801455f794---45451600638.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/7014cb8d4253898ccf7e2d1fde5cb482/borepeviguzojavederagase.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/logitugusi.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/41583458033.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d89df2570ff3d51bfbd5b52389b3b37/54238105257.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/eqhpigkaf9fstl3u6a5vhoqb02/29641050093.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/92657089427.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/dimikib.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dorikuxizatagusidivufis.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/tuwap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lust+after+a+womanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00029f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29F8F 10380 bytes
SHA-256: ba389c7dbf527d55b74822a7ac0d43d00f32136a9e23c9b568701f6c0a5f6903
font_01_sfnt_off0002b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B723 16300 bytes
SHA-256: c2ea13636aa0b987af0027d033a2fdab4514ad244c93685c596ccd9fe7b51db6
font_02_sfnt_off0002cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD42 30700 bytes
SHA-256: 53f18447937c99f79825c3f5dbecdb304b884613faed02f6fea49d33d002cd09
font_03_sfnt_off00031030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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