Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad4db471462db9a…

MALICIOUS

PDF

83.3 KB Created: 2021-07-21 14:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 982331b1ec2cc37c30e680a2d5afdeae SHA-1: 0c473419eb3e70fdc5696bfc33f07e6cb01476ec SHA-256: 3ad4db471462db9a1be5ede9db09b3fb1a96df254a96d92df2ebea5c9d00fb18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to potentially compromised or disposable hosting sites suggests a phishing or link-farming campaign. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://ogledalata.bg/uploads/pages/files/xilawifiguvuvelawiraf.pdf In PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/l7uvor2trqrnofi30amo086f7u/lenitenumagi.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4763219a8---ruzarijeki.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bad3a4cfb---dovuvikedunupomuli.pdfIn PDF document text
    • https://hirurgija.me//files/95759370475.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/69185460240.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/sosifupuwakebeza.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/naravegadixewavodetut.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/vunobelonopa.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d94e1f40---85142636209.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0ba4ecd9e08ed4443fb5969dfb1043a8/ripufitudu.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/womuxubalexukegubomof.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f1c5975f3ef58215d2ce1a87668c7990/jefafiguxijumopoz.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/tikimot.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/setanikexuditu.pdfIn PDF document text
    • http://dakmet.pl/upload/5525411898.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160946de8b84d2---54871244358.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/52041051355.pdfIn PDF document text
    • http://askort.pl/Upload/file/25412953337.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/bigovijawo.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/c2d97ebf37431178d9366b9e683a04e9/godev.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c65f84daf---lakuko.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/66db2f3af623d2f1f0965d34a2d4174e/woradinozazel.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/35ded7733d357bcf7f6aaf1fa694dd5d/59035611275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=deed+of+sale+of+unregistered+landPDF 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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 16056 bytes
SHA-256: 3fad2736a8128f0390e66eaba2b68b2bb7e7eb3bf1c6f80fe53cf39c28f26c6b
font_01_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 10632 bytes
SHA-256: e2eac3efbe1a374d4afb2dd5e6adb3f94933c2d0dcf4f52253dbdaf4d6140b6b
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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