Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cf31d1ead9fb38…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 16:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e398421ae4ff6efa0079cb7537ce9eef SHA-1: 459f4a3a414a7c9ea130e5de46b7043419071fe4 SHA-256: e0cf31d1ead9fb38b9de1585d30ed1a833be1846e7ea70ed347c48efe74e4470
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a "download button" heuristic further supports this, indicating a lure for users to download further malicious content. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=warhammer+40000+mod+apk PDF link annotation
    • http://reklama-kemerovo.ru/files/files/lowamapare.pdfIn PDF document text
    • https://naves.cz/res/file/55876979063.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/65598852955.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/74437413436.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/gabawel.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/jekulorurizudifajomem.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/52d4f6b45c5c694ee8f82a40e744c6c6/53996656686.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/tulerapolekadomemem.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/petab.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/debefogudurimuwasirubawa.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/sifirujuzawufomeliva.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7083264003737d825d793f16a1f6313b/4421210763.pdfIn PDF document text
    • https://fptica.ru/images/file/wuwofesufigafusu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc42e69ec---26632190964.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/37038628271.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dusenidepa.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/73410340152.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/69874768613.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/momorikagoneme.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/lidodegavuwizitosixak.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140116caeba4---51477073620.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/lesebukukulojeb.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/lasimodivasonexawesatuv.pdfIn PDF document text
    • 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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 10436 bytes
SHA-256: 72b4f526fb3012879f6fedecc8fc7f9cd763ea1d18489d22286dd196e2f908cf
font_02_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 21024 bytes
SHA-256: 9a87a4f3f0afd34df30a07beb69c641bb9af78eab9f94a0be9f8b5446598ed18

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