Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e4d19b76ae03bd…

MALICIOUS

PDF

74.7 KB Created: 2021-06-16 10:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8cc1a1541277d2a03a5b7252668b5998 SHA-1: 4354d122838537fb9e127701c9c03448cbc34844 SHA-256: 52e4d19b76ae03bd98768af201f7a2565d7c79934ea35c8bf300dde1867bd6ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, likely serving as a link farm for phishing or malware distribution. The presence of a "free among us download windows" lure in the document body, combined with the numerous external links, strongly suggests a phishing or social engineering attack. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://wastran.ru/uplcv?utm_term=free+among+us+download+windows PDF link annotation
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16098773849119---jopasosivifelev.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d43f2f1a42---35494250345.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/56533494741.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8295df31e---49782633070.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/43968634969.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48791a83a---razimekalarogasivafolilab.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7e19d3b0---67000812282.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9563128a18a1813788d813bc7cef3200/96328980971.pdfIn PDF document text
    • http://jar-ted.pl/file/guzomilagisopegularuponu.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/desitizet.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715d17913e---84766632333.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/271c4c8e30a6be38f845d38c91f971e2/75955036241.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/wurigeza.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a898d03a2---vifotetitulumezizolil.pdfIn PDF document text
    • http://farashimirooz.com/files/lajixedodarajaz.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/pagodor.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/61e43402ebb4cee7481f19aaa63bf5bf/16310678683.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 5192 bytes
SHA-256: 4ec07350f4d060900e341b858cd08c040e3f28a7fe59c96508020da23ab96cd9
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 10192 bytes
SHA-256: 6f27d46fcb56c294514d08f1171f68bcbd9ee4de097247c8dd2cb071f23824e2