Malicious PDF — malware analysis report

Static analysis result for SHA-256 7387b4f92f4028e6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 15:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef0fef0d14e84c5d5d4392537cc52385 SHA-1: 43f838b5ee8008641cf9cfe9a1c36ce0eb8a5658 SHA-256: 7387b4f92f4028e69cc4f4539b81208a0fb86717b3a17fa81aec5fe93c780500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself appears to be a link farm, with many distinct hosts and links, indicating an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwama4.vn/webroot/img/files/94721196017.pdf In PDF document text
    • http://jjinline.org/file_upload/file/86245106340.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/92218153930.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-22/20210822040327668253.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb983fcca---57444621602.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/94794747842.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/tiduriji.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/936e21e77fbe3000a5c2281611a22592/kaduragujevu.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071009515380554.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1e8e8b895---84920523725.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/kajisusodewelibukirumogi.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/337453896.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/lezowitetoz.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c6aef1d6b3174450398f2010a5b68161/pufasibireluponat.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bea34a7857c---29131005924.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/74990089187.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/munimifusaxuvog.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/17a0e9bc2b0a215f99c07abfe1136705/68698438569.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/birewuvemigadu.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/45244736986.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/76581933620.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/27367875015.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/9574963710.pdfIn PDF document text
    • http://endemic-capital.com/uploads/files/gebebebovot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wilhelm+reich+livros+pdfPDF 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_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 10580 bytes
SHA-256: cb2705e22cce87670f518e06d01d59bae362edaf373266424a114f0452cb4cd0
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 21892 bytes
SHA-256: 8e3f0675f0f95ca0b51b1c919147b885550199006a14bda653e534e1fbdabbe9
font_02_sfnt_off00013b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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