Malicious PDF — malware analysis report

Static analysis result for SHA-256 239727c8e441dc75…

MALICIOUS

PDF

87.4 KB Created: 2021-09-15 19:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b60937808547e152fead286918f53bda SHA-1: f5b4a78e2820e677dcdbbbcafd4afcaaf0b666c0 SHA-256: 239727c8e441dc755a257f58475dbd8e349b67d2c15c7898de8b0216cffceaff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms on potentially compromised CMS uploads points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=app+teletext+android PDF link annotation
    • http://kleinschaden.expert/userfiles/file/9056702494.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/sivutid.pdfIn PDF document text
    • https://shevian.com/images/file/81192291471.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/meduvasurebitowepesavup.pdfIn PDF document text
    • http://glttek.com/userfiles/file/16821787601.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/lubugu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/1630023474.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/59766787804.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/tesixudut.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/sopufuzadefibobaxu.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/36731578532.pdfIn PDF document text
    • http://fourfoods.com/images/files/13685846631.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613234e24f45c---viduvawijidezafexujokobo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6aca83be508c93d844325aea3146343a/kixujabowel.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6cef8c982610f6eb3184c04904e1352a/56686185005.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2vsb2t0bai55k4ccisi7fngcmn/zizoladasiterapu.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/nebokodugujekevi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2bc57acb---19715565773.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/48123605444.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/92d6elf9soeh6huhm0s72uke9q/ruwavus.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/nukatogixozasixipasu.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/13993231448.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/fagevifurozosuvuxovuvavol.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/muloxi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/632c1185c4c0a44a483b78a99ad2c051/80976083499.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_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 10300 bytes
SHA-256: f7220d5c1b75841a607e507f02fb9625be2e56ee93e209e8464841ce1b1a979e
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 18168 bytes
SHA-256: 9a5f5fa83db0013dfafb0577c70054fe6b7e55f377fcbd8cf779843c4bbf3e4f

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