Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb7de42639765a1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 10:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 010f1e9afe1484f3ac9f5ef81a064169 SHA-1: ecc4c0e4b4e637b8b87bf2f2f6cb09ee83bc98ca SHA-256: dbb7de42639765a168aa7e4b7860ceaff61c3fd4713d51587c3bb0bc2277041d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=survivalcraft+2+android PDF link annotation
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/jagugotedigodofuvigutima.pdfIn PDF document text
    • http://besteva.com/upload/files/tutideraletowevi.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/jikeworedurapugisona.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631259341.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/21702204580.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/manegenedave.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/35705766851.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/71163445231.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/37517542932.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/korovowuzubigavumitasigef.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/8cdbbe6f6119706b1cdd4b6d21c28de0/nojufufefuwaduduwotukata.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/efdb33b7d271b1254f155b31324ecaa7/69327281180.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/25906300116.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/pobisinerukufiwis.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210912_182852.pdfIn PDF document text
    • http://rideco.hu/upload/file/xipunuvojibuje.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/52937891133.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/16005693869.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/niviwepememigobu.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/vegotudexefijilujujakegu.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/51326264715.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/gakisizokubunogod.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/fawezutukewagivi.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614139f17a336---80579024100.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/nogujisowar.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_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 22404 bytes
SHA-256: 30525a9ddbc49064aa791f897c968169d072aecbfb387ad5c9d4f9dd8d6d5aeb
font_01_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 10532 bytes
SHA-256: c1cf070c9b6d505a17f29c1ebcd0fb39acf2b2ff397f1583905da08b4eba774c
font_02_sfnt_off000125ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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