Malicious PDF — malware analysis report

Static analysis result for SHA-256 288268af75a8b7cb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 18:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d4a69dd0b02308762c443ce8ac0be2cc SHA-1: e4846846c5aee653f1b4d66e6dca716b38ee6b68 SHA-256: 288268af75a8b7cb8800fd096c98aef9d1ec24f6c849589bfcb504f222983aa9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or SEO poisoning tactic to lure users. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=agile+software+development+principles+patterns+and+practices+pdf+free+download PDF link annotation
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/nupujazun.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1626560254vukusaxerivozot.pdfIn PDF document text
    • http://onlinevay.com/upload/files/danaribamazusikekuner.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea34bc5588---zirijanasadekuvelabiduju.pdfIn PDF document text
    • http://temple.mo/userfiles/file/dedorujiripavej.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/worakuguped.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c5b62027eb618128c61cbb24d42a0aa6/22306560670.pdfIn PDF document text
    • https://bauarch.bg/files/70109283211.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b47cd404e---17381467799.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f7sc5nbfr6jbabuj8l80rv5itk/nuzuvamiruzimova.pdfIn PDF document text
    • https://etimes.mn/uploads/files/kemale.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/063afeadeefe774ac3db944cc04cb3c7/zexiwigim.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/zarikojexivimunepozizisu.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f861add8a2a161d2b8cba596006da780/gemakakifewon.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/93950783525.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0afe26a09b0d6ed7725099e7980d8874/29280552306.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/33184768822.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/nosexapusaxebop.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/unr22p5g96ggs3tsl3vnuodd88/guxolazosixizijesulu.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8d4e794c---dafofemimomumimosituwus.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/dupewizokofofe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 17956 bytes
SHA-256: 0adc4affe1df3948f844d04447944627c2556fb38fdb21c1c77adfc899f29f46
font_01_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 11096 bytes
SHA-256: 562d96bc4b575dea47efdad56365bb4fcb1669242e43333961c8a61fe6a9513a
font_02_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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