Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f239863f58fe40…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 16:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 176f74a7bca606e18f7dfd2ee3ae3f8d SHA-1: 1e3a0ac2d158251ea8edc45e9c8d40f861a5010c SHA-256: 18f239863f58fe40e971f92f188496167f9f2ac407c9ff3629a1f5802d60d3be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=pmp+green+book+pdf+free+download PDF link annotation
    • http://veoguidecostarica.com/ci/userfiles/files/xaxesujipufogatax.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/zuxeguxazuzufoba.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ca70c67c93d6389777d19edf60c0fcc5/fajavedovodirujiwel.pdfIn PDF document text
    • https://ka-base.no/images_students/files/zedadakanapurogumowen.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306e08986db---dexurosiwulexakapofen.pdfIn PDF document text
    • http://chongros.com/userData/board/file/sexuvukukizamemupur.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-3/20210903215429185207.pdfIn PDF document text
    • http://abwrva.com/uploads/files/37365122758.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/712c577490fe67da3a0d1a81b6a51d56/joxitarulaf.pdfIn PDF document text
    • http://jar-ted.pl/file/vuwatosaporewugomivida.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/voxaximapuxipige.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dba79827c---58089702953.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/kexubabasotatuz.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370532c8664---pemeka.pdfIn PDF document text
    • http://islandpointfl.com/userimages/63326653952.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/33681777719.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/sivuvutubunivopaz.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/15153367052.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131471fa1da1---47462231797.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/romozidifapugemu.pdfIn PDF document text
    • http://jngf.cn/files/file/benuwobadoze.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/39857937831.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1fc614abb59acb991ff6da26a75db816/xolewiparido.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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10800 bytes
SHA-256: 6908003790bdbd78d165c5d9435cc1290b42ae82f2c8d6f56b2e3ae68ada2100
font_02_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 18424 bytes
SHA-256: 1fb3b4fbd6ca27f2012b17ee5c67afe20afb9573596ba6d1155c0dc80d13597c

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