Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dead7eaeb660b40…

MALICIOUS

PDF

84.1 KB Created: 2021-08-24 00:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebdcef5e1fd0529a9cbf6cd6c8f0ef29 SHA-1: 323567b3e82fef3601b00ff303eabd09f6e4164d SHA-256: 0dead7eaeb660b406c7a3221b909af6949cb534463c6f17c58b2b52d36881af3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 compromised WordPress sites and disposable hosting, suggesting an attempt to trick users into downloading a payload. The presence of a download button lure and callback phishing elements further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://mail-ex.net/userfiles/file/kedagepikiganoredisadu.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/759l8j24144rn2q6r12brk0mtk/69245739145.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/dajusoxune.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8e5091a29---muvoradisagesenuzikide.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5251f126a---budak.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/98019679286.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/zinamumalowato.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/natuxubitito.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/30459571703.pdfIn PDF document text
    • https://bdata.vn/upload/files/82859046664.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/979f6777c67ca919f9b2aaefdb74e754/latamema.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/34313394010.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj6nk6e748163pv7839s6s04a0/luvidufabukefunu.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/73159828202.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/spcrluiefifib6hq83r4nt98b0/xisomitapekopesazab.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/93517874164.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906075a25d1---62523608194.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a328bf99---16824198105.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9f53cc307416ab72b3eab2a8b8698c49/feneful.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/nogeginesoxi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c205f5d906e---92646348955.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/90381217281.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/74529676608.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/tabisagelokasufokog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=jaiib+accounting+and+finance+for+bankers+study+material+pdfPDF 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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 18264 bytes
SHA-256: 1eaeb879876dc3ac905928ef25fc098b4c98fb5d2d0b5426e5c8975d243dbf1b
font_01_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12729 11400 bytes
SHA-256: d3412996fb0be25532674e1916a392cb00a591c6c6f63c28fe0f3a3642f448a0

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