Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa23484035c4837…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 08:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc089dc43152794e2e5116ef8c59d4a5 SHA-1: 66c89a8c577af28536b07e75a70f081450e1b71e SHA-256: 4fa23484035c4837f901d463547b782ac7866daef63ddcefd3dfa38ba2c4bb38
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/j8bokv4lv9n5j31ddnpi3r5mol/66146530260.pdf
    • http://global-insurance-broker.de/downloads/zebatomefudutanobaka.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/d5ud9b143a9341bnltdq7eitkb/88213356564.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2c4f3dc9---tojivofar.pdf
    • http://studiolegalezullo.eu/userfiles/files/97386582529.pdf
    • https://hotel-la-licorne.fr/userfiles/file/geterovixumofejorodubixe.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0203b231b915b9eb252799ee8ad65076/viruratawujobobititirur.pdf
    • http://mnogonomerov.ru/uploads/file/gagutumisivitosalizis.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31ec606d5---83812259287.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/96timihlmpnu8cclk5a6t5q0er/migujirodezokorikemo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a516737f---ruzosixegimiju.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/43e65712a324125271ee5a32be04de77/55540279385.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/53ec50dda93b7560d1700b9b77a18a6d/xaxol.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b45ee1251---35313895333.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lebhriuauepkbe46ols4udklq5/navininejopiraruzatedej.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9d89e96b56ee8446aa2a342f79e99ea7/xajekote.pdf
    • http://www.aportecnica.com/imagenes/editor/file/48990315197.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf04b00a1d---dejapafuratubabe.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ufpnhcb1eojbv5d3ilf847plta/wiwit.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078401901d2c---fejeweguxixojefaridibi.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3799147d7164dc488309bd481a37cee7/pozoluvoduzize.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/hvv5kn8noluaojjnrhafoe8j2o/pilaxonawefevugasixiles.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc47ff29c9---sarorapilanewaga.pdf
    • https://brod-plovdiv.com/images/dilemufubas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+lucky+patcher+for+android+latest+version
    • 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_off0000ea8d.bin
7513e8fc5a9742064bac7515d1803b21ae911532d1fe6531a0d5a57a4ebf48a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 11176 bytes
font_01_sfnt_off000104be.bin
3d365ba64df0d221dcbeb8885a3db1b7d1c3ba3f944abb160ab4e9581b4ea3d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 22436 bytes
font_02_sfnt_off00013c98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 16792 bytes

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