Malicious PDF — malware analysis report

Static analysis result for SHA-256 50944a0bdfd85e81…

MALICIOUS

PDF

94.2 KB Created: 2021-06-27 00:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4151f15c354ba64a3867a1329d880530 SHA-1: a5300c5ce18e055fd7f8cf07e6308a43148d26a4 SHA-256: 50944a0bdfd85e810a122364161c09d0f5da2b5fdcb3fe26efa351e86053e1fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, forming a link farm designed to redirect users. The PDF structure and embedded URLs suggest a phishing or scam campaign, likely using a lure related to 'electrical power quality notes' as indicated by one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pistant.ru/uplcv?utm_term=electrical+power+quality+notes+pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fed1757e6d888b951fff53902fa3366c/77157200926.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9a4d5d30---86997751712.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25cd4ce828---kukifoxogiwiniguna.pdf
    • https://sofupingame.com/calisma2/files/uploads/70902625306.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/nipavebadobabawobudugu.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bceb6b4003b0fb26748ed95c818b917b/magewoxi.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086588a23fc9---fefovesadaroxes.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28d26d5b5---12675831191.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7382a17fc9---43240143821.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6dba8fb1---befizivejusilanunuxufu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616cd0e9a4---68569060683.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52920dc8c---84321655213.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430092758941386.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5ed9c9297f64866cb602b84b538021b6/gitenavuxevazunuxisukipot.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7a52df913703b65515a5495dd67ab957/babasaros.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/087bbfc2fa64ec91e93d49554d537954/tukalurizereb.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3ba3fb98---naposolod.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ead500de---sekara.pdf
    • https://minegociomiweb.com/userfiles/file/61222103067.pdf
    • https://biocoils.com/img/file/19340450257.pdf
    • http://septumdent.com/img/userfiles/files/1157136871.pdf
    • http://nowyhotelik.pl/userfiles/file/befunekaxokarimapereru.pdf
    • http://peaceinsrilanka.lk/userfiles/file/ridepejipisan.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/89102720374.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105010907433481.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_off00010c18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 16792 bytes
font_01_sfnt_off0001242a.bin
107dcd290526260699ca9ca7eee3a88bcfd3482de84e4377252c81afea614875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 17368 bytes
font_02_sfnt_off000151b4.bin
6f923b475399acb807cd98022d1721716f9f5163b263fd2731f4cc6bd32ca3dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151B4 11044 bytes

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