Malicious PDF — malware analysis report

Static analysis result for SHA-256 317305a26a9bb7a1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 09:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f96963f181493f411ec512dac5a353c7 SHA-1: 15892504a2cf67ab9809ccfca0efbefc5ee36090 SHA-256: 317305a26a9bb7a1866dd8b5f775e473e8dfad57f863e0bc1e112897fa630e42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple link farms pointing to compromised CMS upload storage and disposable hosting suggests an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it acts as a lure to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://rubyyadav.com/nbloom/fckuploads/file/88576471937.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6a8e0591f217560f4b1f2ffd3bbeeca6/razukoborijonu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cf8e0c2bqo19dg0fv14jb75aq2/62965960126.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/donoxanuworu.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/53470166030.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/virezusonetab.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332831a29b8---80006412402.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/46755966642.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/eb15f8d8d7888210af1346625ec4ff7e/78780012474.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vefubugudaliwuz.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/56324709211.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/46533033436.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/watezu.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/15893008580.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/69345243510.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/51328975275.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c83d0c983---girufimixud.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/miribomin.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/2141565862.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/daginofeka.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/papelokitusilefunera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=transformers+tamil+dubbed+movie+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_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 17236 bytes
SHA-256: b072327ac6df83a72654d1e2784b4dd2e98e5999a783a5102f5a248c47f2428f
font_02_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 10868 bytes
SHA-256: 9e6e8fb549286d7a5776e05c456ed4be79fe501cdf264c56b3d0cc35574a2642

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