Malicious PDF — malware analysis report

Static analysis result for SHA-256 58eb5fb243b861d8…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 21:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b68e7ea67191c2267f5df8975d5f2e3 SHA-1: 3eee2f022f5cb45fe1af0cebbff07feec6b8f213 SHA-256: 58eb5fb243b861d855dbb92ea7e9dcee34a8f1492a1c3685dd9d79c5208a9e7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://pokemom2.com/uploads/files/rizavepipejolewufezunawix.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/828919f5e68b76128adbe9cbff3945c5/lofobipexukigasudezojewum.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161378e1daf6cb---70625465376.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/4883471529.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/temakijibope.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/liwos.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/80861949032.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/75866319258.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/77482072820.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vajilaxexufub.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/pafepevadopezowanakusati.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391938c1380---kuvewibe.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/luvuredesejakusijexagile.pdfIn PDF document text
    • http://ore-processing.ru/d/files/23871206910.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/68c50871a8aaa48cf99aee39fcb427d9/rogozokibakizijolinan.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/petumedisimulabafafalufu.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109040101105714.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/laxav.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/48862044515.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/zesefelukelazute.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/83550961454.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/fariwamedisolomizolid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+mobile+gun+modPDF 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_off0000bddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDB 18536 bytes
SHA-256: a0ad34259cc7a9bd14159f0c5ab37af8f3fc52abe43fce3a7cf7a8c1ec50891a
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 10884 bytes
SHA-256: 0a11b1765db59d755116399825eac42b96e5386ea7968acbf27a075a14986e91
font_02_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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