Malicious PDF — malware analysis report

Static analysis result for SHA-256 0152fe338311f923…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 14:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 049835b84e10ad09009520f1d22a0928 SHA-1: ff95a058d5e0e07dcd9bfc8f9bbd25792d6e931d SHA-256: 0152fe338311f9239f45de1da15619b2938ddb806bd23c1319e76a837c05e561
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, it features a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or conduct phishing operations. The presence of these elements strongly indicates a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--hjrnskadeakademien-mtb.se/userfiles/file/xekitudunotutosam.pdf In PDF document text
    • http://balogmihaly.hu/UserFiles/file/40455546454.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/38529dd0c73208389d8784f125be6ba9/gogemojuv.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/27561870896.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d3f2334361654cfa44bc1aee287928b8/39038018672.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138d906ad1d7---31206880787.pdfIn PDF document text
    • http://bienbao.net/uploads/files/21936458431.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/44735393310.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/mowuz.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/paratukibemele.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/82406e277544bdfb7d2b9bde887a938a/59136863726.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/68715359401.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613690b88627c---53583162244.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/vivoj.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22206788278.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/xowajurexeromezenewi.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/sizemixupuz.pdfIn PDF document text
    • https://rosycaffe.com/file/62856180502.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/mewabujinisukurajo.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48649764474.pdfIn PDF document text
    • http://strandedtattoo.info/file/wogofifaz.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/vusavibikugewiv.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309673ba655---85664867734.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614427f69bb84---37390416298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=apex+launcher+app+apk+downloadPDF 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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 17616 bytes
SHA-256: cc5d63a145dfa91741962fed611761c2a381c58582227b16bebd62a46b0f2cd1
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 10612 bytes
SHA-256: 861001b1597fbd4cfaf3c8ad41901259a7860cac5abcad0fe16a09d1bf3003be

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