Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f37a579a595324…

MALICIOUS

PDF

92.7 KB Created: 2021-06-28 23:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3aca4d8510e1d25bb793dc712cfeeac8 SHA-1: 9893c5386ec037ef14fc368a732e8c8c53870e19 SHA-256: 59f37a579a59532441088dbb5b95d69d02f400fa26e78612294e940ea33f84cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The PDF_RANDOM_URL_LINK heuristic indicates a link to an algorithmically generated URL, further supporting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607344ea5f644---10465268503.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ccaf64aec4ed36841e49b39fa2390f7d/31187962340.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527211632.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/37658b5203013aa07a4bb425be399696/89257810294.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7k5o8gckve0f331dgbhjt81hfn/30134919366.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/smp84oo88d5ab4tgth4n7dc405/kijisilaximenalubiriwixal.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/be619ce1940fce1a332a55a494cd4b72/39310629522.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6492221622---44157065548.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mpfaftnritq68p00k9t11mcph3/novutofoterubifuduz.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076457e4a22f---xazowudizofipe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/62577797673.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/sikofoni.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad1d87c19---28032915246.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/63693254153.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9dd271df426e515eb4cbc7519692ac8b/80139372596.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d95ba74cb070490bb41e005e20f3d16d/tesagib.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/eoobfn891gl29uoqo815o27uv5/rilibaxuruwineveriruli.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/43028808578.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab258e633---76301903536.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/tuvizuv.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3719496b4d6c55f09d59f7fe86e638f8/fazikosusijinepizowalixo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac099587afc---kipejekuvadurumezawi.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/53853291202.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/25a434f75486e51291f46758a6729033/59498247015.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/wonowudupisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+did+the+virginia+plan+consist+ofPDF 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_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 17168 bytes
SHA-256: a1097c99978506a33bea47c1edcc9fc18bdab78a79dcc47ab7fa3cc7abdf90da
font_01_sfnt_off000133ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FF 10956 bytes
SHA-256: 60b0e697b74f5c435a7d239ab2d453afc243044f987debb315df5e492559c598
font_02_sfnt_off00014d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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