Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6e802b808da575…

MALICIOUS

PDF

76.3 KB Created: 2021-06-08 20:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a45a9af96fc997a2bea0e9fe9f0254d1 SHA-1: 563170000ca9d757b92d0a5f04f8ec797ce93ef0 SHA-256: 7b6e802b808da5756e68b967a96110071f46de65c1c23bf77cccc004366010bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and potentially malicious downloads, disguised with lures like 'among us apk download 2021'. The presence of numerous external URIs and compromised CMS upload links points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=among+us+apk+download+2021 PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce72843b9c---19490871763.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/25648949972.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a0a3a72e7c6059bad0612b2bf96146e7/18592946187.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af3502035---sasagix.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/vijexelusevuxomut.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160832050cc091---42214325636.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce116c594---maxewaxozoso.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/80707360845.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/peminojulifi.pdfIn PDF document text
    • http://abnicum.com/files/file/mekufuvofutosefot.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a8fdfea56b7ff68b776dd4fa0d0e416f/77320352073.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae91bcc0d---9257986694.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/zutizeloladoxaxaxuvexig.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9fv8lljb4e3f71ioqahht3u6sg/54004141305.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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 5656 bytes
SHA-256: dfe2af7376d7f9120da9bde3fd6c36c6abcaae609deb225221e4b357b18bf069
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 10492 bytes
SHA-256: d17f976d8a215ba00cc122dc57f33526415b58607b47789a2d6e23dfa2b40bb5

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