Malicious PDF — malware analysis report

Static analysis result for SHA-256 772d2f3fcd07b4b5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 02:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e88ab02138f7cb1ebe538ec89491220b SHA-1: 80e33587b48f394e5eeddf5089546154ea4591a5 SHA-256: 772d2f3fcd07b4b5f5865e3119cf211f4108cf3bc0b47b34f0bb242272455e52
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a0346a035b268b3e2cbddb1bf6729207/53138252196.pdf In PDF document text
    • http://abworder.com/uploads/files/lezote.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/lejurusizegi.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/75335035499.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/zetibesawemafinozimid.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/19928121736.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/91072211981.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/52993212466.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/51045019951.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/u8jq60r5hmb59gndavgk32rlq5/rozezododopiveb.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/54935670000.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ece5bb35---91014193365.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/popaxupugakidaju.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/juxolinazutuli.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/19325119070.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5a30b8fc1d03f4dd77059084c4f70eea/momofilane.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d64836372c54f6f2b4977e9a7cbfce7d/siloxaneritugawuzosimupop.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/21871850496.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624229917.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/92555713307.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b046950d7cb---fazilukofaloxip.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b73cdd9dce31c19fe752363af62e7076/40573056173.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8046aed2---demibulemivopo.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/86831039950.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9989b136---27633230683.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/sd37qp4ea7j60nv4hpo375rta6/kuwurifanepome.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/56239380042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rancho+clubhouse+gta+5PDF link annotation
    • 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_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 19680 bytes
SHA-256: 0e8aa1f747000b7cca67fe4f6dfb696a180829a87bb3fd5579f5045e3822904c
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 10736 bytes
SHA-256: 335889fbf87382b715e86d53083ae3e0df39e229e1a92624630ebc917e21b1ff

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