Malicious PDF — malware analysis report

Static analysis result for SHA-256 205a6b3420399780…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 02:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c97b122924541e230dbf91effe6ba1b2 SHA-1: 39837a89a4c803e7994a8a58c06d11dba3db16d8 SHA-256: 205a6b34203997804b7ce25e13e98bea3de9c262b86c11b9e829a9f0b2854624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that host other PDF files. This suggests a multi-stage attack, likely involving phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=how+to+get+white+box+off+firestick PDF link annotation
    • http://radio6deenero.com/uploaded/files/parus.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/16750324261.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9e349e57e6be595fc78991e2e229f2ff/fatasubegudokome.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1aea7cd3---pakisumodutikiferasesatud.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b3729baa5---pavubonaranib.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/noradevat.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/36436795030.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/8102873122.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614eecf596331---xarowesaxazovapewixuf.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/rigiwaderizep.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/85255917945.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/bufamokulalo.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/99352139564.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/28658903394.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/zopubidoteruxe.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/duguwibaziror.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/roniz.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/9536016268.pdfIn PDF document text
    • http://kahasat.cz/data/file/zipujozenosasiparizavoto.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/14539154187.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613798b07c910---58216944880.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/kutasijigu.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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 16260 bytes
SHA-256: b3048c7f1e668758c2a15adcd89722affd671a61b08be5ad693acb1090c3ae36
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10712 bytes
SHA-256: 3d03b1222c1e8ac028508f57221c3a2bca14720a7fba67043182c76bb54d37e9