Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c72b8f4a12c992…

MALICIOUS

PDF

102.3 KB Created: 2021-08-14 21:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e56a9b29224ed8c338950ae784a395c SHA-1: 9cdc60a4b781e9e9dc44453fcba17868c507801f SHA-256: a7c72b8f4a12c992b1edd0e9a5e7a328b998b0d995e439c450ea47bb7abe7cbe
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farms indicates an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://crysiq.ru/uplcv?utm_term=scheppach+basato+4+bandsaw+review PDF link annotation
    • http://kadh.kr/bobod/upload/file/15419947379.pdfIn PDF document text
    • http://leguido.net/files/88301858300.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14e7971e1---98528906296.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1a01b6f6af7747c59663cfa7ddba0350/36186765623.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f76c030d2---ruxovatedujawusigono.pdfIn PDF document text
    • http://dakmet.pl/upload/jefobonizu.pdfIn PDF document text
    • http://tythb.com//uploadfile/files/16250922709.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/64596171581.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/113a78faf49a08e602830261b7f9cc0c/xoruwesaneketosereweru.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160985ad813bf4---betifabixo.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/88845047937.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/032314401971.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ih023bscct0nsvta2g7ntfbbt3/47040836360.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cu3v9asdt0oop7d3r9b70pagt3/tixizam.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/korisixezelan.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/5608144618.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0e89aeebfb1f03e9b1b7ec115714ae09/64373588600.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/35837964753.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021072023104673499.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e88d31bda203c2dc1ce61b246378f669/wasele.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/wabovonufu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac43b081fd---zisumudowadoj.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 17568 bytes
SHA-256: 14d91c36a97d288420b0522a92b1993d38d9a4c329694a357d1045bfea415b60
font_01_sfnt_off00014125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14125 11008 bytes
SHA-256: 2f910448283b4a4617d96e17256a04d610b84a56bcd2c3fab1f8c1d064be1a9d
font_02_sfnt_off00015a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000172a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A4 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d

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