Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d8ea698db74e14…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 09:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23c73135fe21cdea78e216a0c77c2f6b SHA-1: fdc67ddb43da1c57e99851a66c38830ee6f4e89d SHA-256: 04d8ea698db74e14b785a82cfd750a8d273675a5b48c8fa5ad492d808743d796
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification confirm the malicious nature. While no scripts were directly extracted, the structure and linked content indicate an attempt to exploit users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://huntic.ru/uplcv?utm_term=acdsee+pro+5+free+download+with+crack
    • http://sistersaviopublicschool.com/userfiles/file/tinuranogapeliralij.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2aecf856a161264871ec10b74ba065fe/jawetupe.pdf
    • https://jooli.ru/ckfinder/userfiles/files/55363390043.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081864101a2c---fotifugajojaf.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac745bbe53---97443817777.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/r273gskg3n4u5gcgtvbc3sbb63/27059168184.pdf
    • http://polloricowings.com/uploads/files/90395441475.pdf
    • https://ms01bet.net/contents//files/wesitomifukovediroga.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/90159066494.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0faf5325ff---81646384154.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c32929cf0cf95cae3aa5e7acc12f9745/webixokamijibibuto.pdf
    • http://praconsulgroup.ru/pict/file/sebegatovefik.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c35ab140---76959118931.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/00k1bff724mhsqpdhnvksd4tvo/63239503293.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a54n9u10kjeti5vu363lviude6/26613978478.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9342ca3d---wekabama.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0632d04ed7---94861555172.pdf
    • http://thingsantiquesla.com/userfiles/files/63635333147.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/k0re29v3er03ioaj93na8nm8in/putolosixadeponibo.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/eb49342820b08e177ce84ba2bdbb634c/60494846290.pdf
    • http://amandatravel.com/userfiles/file/46293235054.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/46b2bc20f71abc16fa0ead0fcdf357a4/dozoxade.pdf
    • https://ludifrance.fr/userfiles/file/28055067911.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/a36u4hk79vhedapq19ea48m7h0/15718806406.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 16792 bytes
font_01_sfnt_off000107d1.bin
4a22ce62abc2fd74419dd7f9f048dd7d46f84d7e9c420abb646a6594d0b2a73f
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 17772 bytes
font_02_sfnt_off00013666.bin
1604a31eb1ccaa1e2fb7725d6661c31463956b8a8b20256f2b97a6b1547d9121
pdf-font-stream PDF embedded font (sfnt) at offset 0x13666 11012 bytes