Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b71148aabf9076…

MALICIOUS

PDF

307.1 KB Created: 2021-07-29 11:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cac7eaf3c42760a00d5317ed5c9d4b75 SHA-1: 8c9ed850118a35784b289649f54d026bdd544de3 SHA-256: 85b71148aabf907636d6d3b2d47fc2cec7ecec0879dbbe572cb61eef62d7e8c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress upload storage and other unknown hosts, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

Heuristics 5

  • 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.
  • 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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c46c59d9---44776667319.pdf In PDF document text
    • http://hanasushimenifee.com/uploads/files/59662649215.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/57307967728.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c1f13250e---madaguketi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f14cee91d7---379442962.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ede968e7735---fekegir.pdfIn PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/4203364973.pdfIn PDF document text
    • http://ipublicity.cz/data/file/82778284242.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/u2h7cf2f23dl4u3c1tk59cgnsa/juvogegulikezit.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7775df43cc35646780d90365fd3382c1/pufetofobinawiwaxinagixa.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4207c15dbf---nobepuduropurowi.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/11341014592.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097553c973aa---43429317346.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/gegixigefelozi.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/povera.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/mubudexubiragabiv.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/figuvatuje.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/11470576549.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/gavudawotepakozosigola.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/09subu6t582mdglum1gu78svs1/83459068661.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3d839365---43541733329.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9f480d5f6---72808960585.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d7c5e0c2a---xenedovixu.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4918b7627133c48dfad0415a379c26c9/buvoresimazosipebaj.pdfIn PDF document text
    • http://wsm.hk/images/files/vujom.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742bcc078d6---3211410575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gema+garc%C3%ADa+guevara+esposa+de+alan+ramirezPDF 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_off00045076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45076 11088 bytes
SHA-256: 7da3a4fe08fe145097e94f8352311237de3904a49276942972e5b69816cb6424
font_01_sfnt_off00046a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00048220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48220 23496 bytes
SHA-256: a4a28b8c4b1cf62fcdd47ea62547c00dd58b43252a792a631d58a43402332507

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