Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffad77e0403ff90c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-10 04:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0f76edc939e9302c376ae6517f640175 SHA-1: 6ae9851e94c43dcaf6f9f144d4b94a4e08b55f5c SHA-256: ffad77e0403ff90c9ac366c64bc52d1f6827cf81b52305bb9d6d80232f8c7056
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous links, including one with a 'secure vpn premium apk free download' UTM term, suggests a phishing or scam attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mudrkanuch.sk/editor_uploads/system/files/parudavab.pdf In PDF document text
    • http://hinodanang.com/uploads/image/files/56836520267.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/kizomenubilulexupe.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/vimafuzesudamewawive.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/5753008430.pdfIn PDF document text
    • http://koala-al.com/d/files/74935370245.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/36296548412.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5ml2tmllmts09n4v2kknobctqv/51633783671.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/7620815290.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/43959647497.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/xewepakil.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fuwevufakawelu.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/gejewamom.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/550ebf80e20d7587cdfdca2388de7023/najumanevidanozovezanutej.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/buretobavoniwijoworinob.pdfIn PDF document text
    • http://amandamaitland.com/images/file/28185840460.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/49535313785.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/pipaxiwotulitevopevaf.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/37316390699.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/pegulaxakumurisetofivo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6a2fdb0fab71f8512c6dabd13c5272c7/vopuza.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/savufelevumawuxilamuk.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/nibogijekifex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=secure+vpn+premium+apk+free+downloadPDF link annotation
    • https://b2cdemo.tickets.com/content/files/60480323015.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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 10932 bytes
SHA-256: cc9159cb434829b0cf4b9b0a834832bb673f9fd54e3cd03365fa0c83de13697b
font_02_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 14640 bytes
SHA-256: a19bd3dab7fd114818fe0959b42b793c893f93a23f699f2470558eb84d7da0c6