Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34f46f37c355c22…

MALICIOUS

PDF

95.2 KB Created: 2021-07-24 09:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2f06a11b3f3d59b77e3f0f33c7bfe03 SHA-1: 691749c8c214086d85d096f7f60d3cd312293ef8 SHA-256: b34f46f37c355c22ac47e62180987e38f51f091f64e97b2fd5d4c5d59dae2ef5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ivncfpmlcrdck5gs2t8d5n1q28/kelozewamunugoneza.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/10g5hrm2mnr1af130ff6g55lu6/novafifame.pdfIn PDF document text
    • https://vestol.bg/files/file/vedotitebisulosadojumom.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/fakofolebudulupulira.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8eb9ee16b---9983799179.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd24832313---nexunilotedug.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/dd3263201f118bf40d162ee48f53b211/diwanatu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/rotagidelupugemag.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/78751326837.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b5b9cc123---7748730050.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/xiwaxutubekavalijadijinaz.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/mijaluxawoxer.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/fb12226caa3d57a3188ede30f26a77d5/dunulubixugizawazadat.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/masika.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/19910131042.pdfIn PDF document text
    • http://amdind.com/userfiles/file/fonirem.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/87089753166.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/lefavanonekurovuxupov.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/wezevelesejeba.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunexozejadiwirexuvonaves.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/32594993851.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02e6d274f---verusodakinologepepetat.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e910c36877---2626540398.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/85414815882.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/57875086560.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/22646554242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=understanding+culture+society+and+politics+pdf+free+downloadPDF 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_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 11104 bytes
SHA-256: b7ab1555a36d6482d8f53b6c078a8f90c151d6cdf95b655023a0f824cf2f985f
font_01_sfnt_off00012718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 17652 bytes
SHA-256: ac9662eae40a51bfbdf2ba5349688926e30f12db8e8cea3e1f6488706f491adf
font_02_sfnt_off0001556a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1