Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a07afbf97acf809…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 18:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d9a237a34edc917cfeb1b79ab2fac17 SHA-1: 925eaa475699a76b9886779afc792c6e0855d643 SHA-256: 0a07afbf97acf809935903b52702ef70460b70d98dfe32da717f6b9aafa4c62a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • 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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26f29c495---1157463772.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50ea820f3---39024007845.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d4f21ea96---fatomenemaserojowapefozu.pdfIn PDF document text
    • https://bczenekar.hu/files/file/xedidavuwolataxaw.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1471b57779---91926587378.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/66368160903.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/dizutasanik.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/luloruvafa.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/28ffe2d3659844ca09b1b7b3bfd45dd6/fojisodanirokivusubenev.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b61dc890---96942287110.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/uvqvsajsvqsimrc7hgkrpcick0/66475611678.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/kekukiwinufukif.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jifew.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/45418322151.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/62798222861.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/lidowofuxujibun.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/lowuvaxarijutexulu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef97a9f1af---deniwofabubijaremalosuva.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/samudugegasavafefalewol.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/parozegez.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5251f126a---budak.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/85862cc64e789d39623843fb3109765b/sepubuzuxipufabuze.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/14819864873.pdfIn PDF document text
    • https://limsurempat.com/contents//files/63319414962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=boson+netsim+ccna+labs+pdfPDF 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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 19972 bytes
SHA-256: df08d5025a00bac9126c69ad42c613f9c8e720a52e8c56e400e6d3be4fe640d3
font_02_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 10872 bytes
SHA-256: c7d107d239ca5a6cfc7fee97737a9cc2219bbb9e67f57036712cdfa4672c41c0

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