Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e01fb18cb71aef…

MALICIOUS

PDF

125.6 KB Created: 2021-07-13 04:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d444cdd18fc1ffa6b295d1a04bf56747 SHA-1: b94ca392fbad9461c2247d750c5240a342f780bb SHA-256: d4e01fb18cb71aef5dae2015f36b770e147941e44ef3289ffeb3dd34bdfb2e03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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.
  • 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://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/35bbd6d177c435623264c9a029c39fab/20321962905.pdf In PDF document text
    • http://clarasonic.com/upload/file/fidekidot.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8707c2a80f---fuwoz.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/018f505b7ec48313d1927622de75ea2d/257977073.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/4608341850.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/dizikoxufupijif.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/63370044092.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8ahesvrme9kss008aftbm95qis/xunipipinagujoje.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609374cb5bbc5---63193025885.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/or6gqeorqa6sjajbdcrk95fjt7/tesizivenizikexuzij.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211234871f---57485902722.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dufodujudev.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/03e60d1cd34243ae6e6fc03bc25480a7/11932500766.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/jevotilobaw.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d933b2c43d---notikapuge.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/16cd76c413c080e482048f10134bfcd7/guxawigudonozojewaku.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/67327978998.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/98437705608.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aae8859cf2d---kisewiripalisug.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/xofubijosozolelov.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609736be5a1bd---72376400852.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/935e708cdeead672f21602074334ea20/durif.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc783696d2d---xigimorezage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=morally+ambiguous+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001612f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1612F 2100 bytes
SHA-256: 38e572c6df274c65fab55aaa68e76329d25027d4caf9374e30b233fe7a26c728
font_01_sfnt_off00016aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAB 20016 bytes
SHA-256: 7b89f8b18296879b41829093f9137f10fb99a7ba8820e24d435beaa90c6996af
font_02_sfnt_off0001a0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AF 10700 bytes
SHA-256: d78e77daf20129fb3238a8929ebb20d248d596154cb8b00fe9f891ff342298c7
font_03_sfnt_off0001b93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001d14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D14D 16500 bytes
SHA-256: bdf6025887ffc0a4a5c1dc319709de1c3f7cf3555f9309b0f3c40a9ee4e71861

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