Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd175c3f7ac4e44…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 10:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3bdcaa5840b9e0b38d8e49c71c1c442 SHA-1: b0b4453838d5bb10093e4addff828f13530f3136 SHA-256: 9cd175c3f7ac4e44a7a0e47d2eddbc65cccc08beeafd15c288f053dfac300481
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on suspicious or potentially compromised domains, indicating a link farm designed to redirect users. The presence of a 'Download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://redskap.ru/userfiles/file/feloxatig.pdf In PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/worogav.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161419a7367114---30878829532.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/baxepu.pdfIn PDF document text
    • https://digireg.nu/upload/mifutojonidipidabowofosi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e83ae988f---bajeduzegesipejumejebajel.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/63978655758.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/91202576883.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gazirexufezibagebu.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/wiwubuju.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f3e83ff14bcac039c2f8228e840b77f2/zorexe.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/55552685233.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/nupalororese.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/23580437708.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/kidobujivimovidim.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/89979533330.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/77bb5e78d74f897f38d2efbee5942cfd/tiwuzatufapu.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/11325455784.pdfIn PDF document text
    • https://architektor.ru/uploads/file/45822794296.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/79711270851.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/velaxibasibabekuzejeliko.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/7725984804.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/92128412253.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/33249980572.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/76869231068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cooking+city+crazy+chef%27s+restaurant+game+mod+apkPDF 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_off0000d011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 11452 bytes
SHA-256: 985d542d66cd64bdb04df4c11ede05b6180d9ba656ddfa60d1ff2090f6761a88
font_01_sfnt_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 17340 bytes
SHA-256: 0bb51366b9199aaf34ae2723cb7af8cbf359381da404947928b486598ba84806