Malicious PDF — malware analysis report

Static analysis result for SHA-256 0196106139413107…

MALICIOUS

PDF

85.0 KB Created: 2021-08-31 07:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5e0d509858f9445af6b4375b6bf76ee8 SHA-1: 98d593717692578a4f1af4bb44fef4d22df52bf6 SHA-256: 019610613941310716feabe293020a156c72d080aeb2712dcbb8b8faa7548309
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://africareview.in/userfiles/file/wejebafufenoti.pdf In PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/22997768997.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/513433321.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/44694777592.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/dufitenanadu.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/41093670879.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874098686e5---makafenoromiwuxelanog.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hp28evi1g1jgsvnhr8pr4bf7m2/jelupin.pdfIn PDF document text
    • https://wineart.online/userfiles/file/14124129906.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f1b4a548003563ae71aec38589203bbe/25142976281.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/jepopatowazo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec99cd994---22029405200.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/mojomug.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/luliruforefisagutaj.pdfIn PDF document text
    • http://xenangheli.vn/public/files/72848312897.pdfIn PDF document text
    • https://jetaime-shop.com/files/sonavex.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/54130596009.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e958d91be4b---25836827027.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210829130332.pdfIn PDF document text
    • http://absigorta.come/file/17349755832.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/12204430831.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/79732685372.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vugujisudowokebokakasaro.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3153f5bbc40b361cd476eb4655dfb9ee/jovuxokusetavixenivir.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/tozezopezawas.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4065d380c4a912aa44a1b63046d5fd04/29310783989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=skeletal+muscle+index+chartPDF 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_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 10884 bytes
SHA-256: c0065118328fa6c8fa442595415f37c78d13ecb95802a01222e67c94d9172666
font_01_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 17680 bytes
SHA-256: 2cd06f30d4017e298573c8c5e8c3f01c25924f4d46f684ab0a5b9368790ec6e1
font_02_sfnt_off00012d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1