Malicious PDF — malware analysis report

Static analysis result for SHA-256 958875cb953fa219…

MALICIOUS

PDF

91.8 KB Created: 2021-09-06 13:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85b002c3c6c010621f1bef8f34221561 SHA-1: ad14b0dfcd6bbc8724af472938f23c18927b5389 SHA-256: 958875cb953fa219683f4fd55819097bf20c831225fc2d2655f90db5d518bd77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites, suggesting a phishing or malware distribution campaign. The PDF likely serves as a lure, directing users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cructi.ru/uplcv?utm_term=launch+jeff+walker+pdf+arabic PDF link annotation
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8abc0bb05---40122400219.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/73464820914.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/nojowefizevogimazutu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ab57f61f683c0bdb6780999ccf7a8149/tilegevemoxunokuv.pdfIn PDF document text
    • https://buka.ru/sadm_files/pewogukemevapagel.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/3592816402.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/4465753956.pdfIn PDF document text
    • http://goref.ru/files/file/witijisiw.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/57630055107.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4294e5e37---tepenenupigerib.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb41a97f8a---ravawawobedetugeb.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/nrrjgaenne2200ht04rlrpgt40/pidukojure.pdfIn PDF document text
    • http://dmkert.hu/files/file/niduduvevukirax.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/36973662306.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/gisifebivemo.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/76576804107.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/950392534.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/mupaj.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111f2f994659---madevegudavokedoxa.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/30516575205.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/rinure.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ddf1f7d8---nalozotezo.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/bazadojiwi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10836 bytes
SHA-256: df81a1896f2b87e1a0765381e3b6b054dbc27df777212feb60b15cc02872d309
font_01_sfnt_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 18128 bytes
SHA-256: ab200859da927b48fd90e1c49818bfca1e6ba40ff24dcacf201a1db33795be85
font_02_sfnt_off0001494e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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