Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce82aa709d8ece0…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 03:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61188d9c2795400a74ba8ebd5fa2fa5b SHA-1: ac27595c59114b1e4323629bd86b6a713c7cd536 SHA-256: 9ce82aa709d8ece00bbdae575f6c69bb5c1df139145ca1b65e8f1e3bfa198ac1
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous links on disposable hosting and compromised CMS upload storage suggests an attempt to obscure the ultimate destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://capitaloffice.pl/fotki/file/sadagek.pdf In PDF document text
    • https://kawanmto.com/contents/files/piwukibivofezo.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/zabepelutuwuta.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134231a968be---kumomanebevalibipaxokuk.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/romiguwalaramiwixikenuv.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31026872547.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1ccd2617---40777465981.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f36e35f68---73117287382.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/retudetolada.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/vukikutokunisizopifumarak.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/93629934894.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/kajorexemagejaj.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/62565252133.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tujujajewudise.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/pakefakosumusenu.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/2638398556.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333b94e69ac---88611682950.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210905205305.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/lomax.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/xalogegojigopa.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/zuzum.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/83733141134.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/76796381658.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47e94ecd1---46744513215.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16133eca003f4e---31816951480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+mirror+a+phone+to+a+tvPDF 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_off0000c2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C9 10800 bytes
SHA-256: 6d8ff83644d2d8bc41451f3b4c4dcd2fcd4ae4c04cb1877c6aa119cc00ad80d9
font_01_sfnt_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 16564 bytes
SHA-256: 3c7dbf0b8fba79a3bbf85eea7df70c889e3dbe675fa21497f8eccdea0d2fa1e0
font_02_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1