Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b049ccabb59aaf…

MALICIOUS

PDF

156.3 KB Created: 2021-06-28 04:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e869d42ec477254871fee3608d8d8f7f SHA-1: 60a062cf9167255daa42c15db59632a503cae661 SHA-256: 25b049ccabb59aaf13bc33e51e71e53844d2d71bb0388155163ce38e31cf35bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and a link farm on disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1d5bc12f2ec8db1ae0c806a1b6015598/31543461662.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f467f8ba93e0953b67d0ca014a98aa54/lajawofisorelivirizev.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1aimcj3ksait6jlc3iopdpcbuh/guxas.pdf
    • http://huile-de-nigelle.info/userfiles/file/912775676.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d52b3b54270---najumexewefukugisew.pdf
    • http://thaiboxes.com/piceditor/file/53185969845.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/509a6c13c4a1efa07f3a19cd60a613ea/18391903524.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/golakijivamepapezu.pdf
    • http://millecolori.it/images/file/kinebe.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/d51h9kc8rnmvbbek9b2e5paha2/fimufixoromo.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ff98e67382960fa1cec81993a9378b6d/daburubokadexuxaxuro.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d933be58ad---xofuvabosuvebunolifenubi.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081791813d13---bobitubuzumoloz.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/6bff2c361cba86f9fb81116cc0796a1b/93656996395.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14ddb6812---38430717198.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/56158f9e8dd00f2855fb20a246f28d23/28769178495.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3c9947dad4e773a5795091525344f1ee/gozosu.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607480db41e6b---mosixaruliwaj.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de53c918cc---zidibaxitafibuditupuluse.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/fadavorevasabovor.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a43667ed389---32833925032.pdf
    • http://thsport.dk/ckfinder/userfiles/files/35558878313.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3162b4b2---29219230446.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=animal+anatomy+and+physiology+lab+manual+answers
    • 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_off0001fae6.bin
79f34a9ce283b29cec0f9b4b59402fa894923c5cc834132102ac65a8a807dfe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAE6 11260 bytes
font_01_sfnt_off000214c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x214C6 16792 bytes
font_02_sfnt_off00022cd8.bin
4ec6aab1c2c1771d8f59d641dec15726e58c41dd4ff3348263955d63198acd8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22CD8 20300 bytes

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