Malicious PDF — malware analysis report

Static analysis result for SHA-256 550306cf88b1ac4d…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 01:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d235d7a3feb0e42b6ae885aa882a3353 SHA-1: bf608a62120e133c64212b3fd73c328f2004b0b5 SHA-256: 550306cf88b1ac4da3b1b45304c7a4efb21c4f9af410be2bc62f627aa00e0e1e
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution scheme. The embedded URLs are designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087460f1e3fb---gepimunafujexikuri.pdf In PDF document text
    • https://parc-hotel.info/file/39543316325.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960f6e0cc---8708791875.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b65406779c---ninewikapukubunedodesawof.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1pdbv7a2u73rbv4h57quplqov1/11538850647.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/c33ff96496f1e233364109bb1d2718a2/43947437974.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/u6kkmdaivubqpb5s1fesl95h54/59702344450.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210509182429_1025971410.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093d6e441800---bagaz.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6349135986a3566b0c15f09bc537bf89/nupirovatarisemekaz.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d329026deba---sadalevoforememek.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b5d2a0a2---tofixijiwikujevovotudos.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64de0a1de---12180406058.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f688f68701---xubiwiximixanigutugasupor.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41e1c5e60---59098171547.pdfIn PDF document text
    • https://ms02bet.com/contents//files/papabojerabi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700fa70c1eb---jojuzewidifuzeleguf.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/05736f84b826ae92eb093047c00a259c/wajulenu.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/81736297100.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/23916927012.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7dceda484a---9035006054.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e2cc0b69696f459d903c928b76b1d509/seluranijavi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xunujepagonurof.pdfIn PDF document text
    • http://dgjst.com/upfile/file/duwufir.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc56ccae0f---nunage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+drive+the+ball+straight+in+golfPDF 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_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 16516 bytes
SHA-256: 001563552fe5a6fbbc9d290af0b36d4a3778d6e6ff9363efaf97b0114cfe2c51
font_01_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 10916 bytes
SHA-256: 75dea5f673787c1007d559b15f1d1f8fec95f2a997195401702319d62eb7c05b
font_02_sfnt_off00012ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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