Malicious PDF — malware analysis report

Static analysis result for SHA-256 118c96f37d6477f5…

MALICIOUS

PDF

98.3 KB Created: 2021-07-08 00:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb90542a323cc8f40afc89da258bb17b SHA-1: bbd70fac7402cc898aee69d70a0244d6a6e1fb27 SHA-256: 118c96f37d6477f555e4a59ccc21631cabd763a13878a268d4b06ac05d54eba1
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the presence of multiple compromised upload links points to a malicious intent to distribute or host further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • 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 http://botosani.ro/img/uploads/file/27673852887.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/j14t9g3327kmd8jc0r3uudve29/29972089935.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/06b6ca67eb1c692b805a8d7a920ae9c6/91962727879.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/s6psps2ifin06jj6977g2oav7d/76985660636.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/70876229117.pdf
    • https://narimasu-chintai.net/jcfiles/file/kafixijobivab.pdf
    • http://lab4050.com/upload/editor/file/ganesetugaruvoluj.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4473d0073---9918368068.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2ehjh8cdq813va6s2r36lm2qvd/gixuzoretave.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1f0100cca695d2abf17a25800444d332/jasepe.pdf
    • https://navliecky.net/userfiles/file/87977032365.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qijdmaeevnjvmqpe0dutd1q95m/mujikenurowudekojizovikol.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb432d2d554---23137088887.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e72e2e441610afb8a4dff23a62a74c53/47147810927.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f92080842b---67738805778.pdf
    • http://syuncyoku.jp/upload/file/gexekupejopoga.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cebf28e88e---rovetokujevajididosubaged.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079702fea60e---nuvumowader.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609de586bc5bf---81584029917.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/280818f34611f44adbfc77715588184c/50041634380.pdf
    • http://kotolantopeni.cz/file/76143388752.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d8717403484cbf896127acd7076fede1/movejufamudomigizanexes.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d0c3c2fc527d5b4854617caf8bef28e1/43729882281.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r7fj1ueag0as9n6t4scdi5um80/libapigujuwukipefafuju.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8c290309---bexekimenesenukemetufifo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=computer+knowledge+questions+and+answers+for+bank+exams
    • 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_off00011c7a.bin
b4d949ae928b74f2c727959c9dd32f401122136d6e7913d98ccfbf0253a1af75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 16972 bytes
font_01_sfnt_off000148be.bin
aba0eda7e8a2624da947dd69cf3ebdd44dfc287caa3bb5e313cf2ed301913d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148BE 11536 bytes
font_02_sfnt_off00016367.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16367 16792 bytes

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