Malicious PDF — malware analysis report

Static analysis result for SHA-256 02252aab1e7e3c5e…

MALICIOUS

PDF

70.6 KB Created: 2021-09-04 15:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f369a1bc5bfc16d6500591dbd47453b9 SHA-1: e6450e1754798c430b0fe2f363460bd413bbab63 SHA-256: 02252aab1e7e3c5e7affa13896e2047c3a865b0821a0e18c92b348f36d7f3d83
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites or download additional malware, aligning with common phishing and downloader tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=hydraulic+bridge+project+pdf PDF link annotation
    • https://vayoto.vn/userfiles/file/22186789360.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8nl0iii83h3i71r3ok6poh5qlp/76815859544.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/86466575805.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097e83dcb023---kasoxumurakenuzudi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160831dbd37998---36852108217.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210709125806_moll6z.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/loboruruwuruzi.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batugumitiwitesoguju.pdfIn PDF document text
    • https://kawanmto.com/contents//files/91501128199.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d5149e16036---30709316707.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e6db970d79f3b22db6051e39d9b976d9/21749407001.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/9f1808cf7d267090d34e1458929ef8a1.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/96761171593.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827cb012f1---zemezipolamojekar.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/kabuzibomizesijikiwu.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/54253877152.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/guvuwitom.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12480d794---gevudimobalawil.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160706bbba7582---fevar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7a8737821---33715218636.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/35365147475.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/70333720532.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/jozewidilerinopefusinip.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/67250716623.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/60155298234.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_off0000b50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50A 10996 bytes
SHA-256: 9498b4507fbddb6a26430d702135af4b5f26dfe07308eb49830b61f27fd31163
font_01_sfnt_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 15540 bytes
SHA-256: 93ee052cfacd11b15f2968aefa1dc40ca0b6be821e0d0ab7600eabab6549a14c

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