Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a010d33c27ac82f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 05:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1e973607c4dacc0f022d3e370d17eab9 SHA-1: bc895f23d4d1128f1ded0560e6cd920ea54fabd7 SHA-256: 7a010d33c27ac82ffb5640130bd296e91d97ad7ae6e77718bab98f44b15c702e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://watertorens.nl/userfiles/file/13234447583.pdf In PDF document text
    • http://officia.tn/file/keruwudoxuzedumuwobaw.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/87b8e2mqqqjdk7o5b1ou28atu4/75044592890.pdfIn PDF document text
    • https://mmszke.hu/files/file/87845089729.pdfIn PDF document text
    • https://vestol.bg/files/file/fikisijitokafixakufub.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/mujemizilir.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/zinuladaterogidepi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaed64849a---6362287041.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/264f5074378b4e38c2d2c6315fd5f113/bezolerete.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1460e19dd7abfa0e6efe90f614cb94d/tutepuzizetezuras.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/79274674323.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210629115314.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/38472275545.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/36a4a3966cafc28cd00340e74ead1993/64294507331.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7q4j1bstq648vbgme9691abvrg/67745321055.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/xoromodujixoluwepa.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1fc165067---jivalufowegop.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/vabagobejivekite.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/juzesuk.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/73734197559.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ac93b92c915e618904100a9f4eec0b96/88967033309.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47439bc2dd---1409364816.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/31603456857.pdfIn PDF document text
    • http://promador.pl/userfiles/file/82746103005.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1462815615---tagewebawus.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57530ed2ad---likeselinubafex.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd8476535---45823132511.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160867a2e9c4cf---xulerofoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=three+differences+between+ionic+and+covalent+bondsPDF 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_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10828 bytes
SHA-256: 3074e4da7bdb046072364e5e63f2b7c7f6720dab8c374e2cd4216fccc8db4437
font_02_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 16796 bytes
SHA-256: 861cacdffd8adec64d3db9707bfa83ba6dcfd3e0979fe7491fcbf31b1bbc8394

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