Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af6a8c2e201a4fd…

MALICIOUS

PDF

89.5 KB Created: 2021-09-01 01:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 121986534b67c76830338e7b125c9dfa SHA-1: 396141434dd516cc38041fb7a2eaa4985b09d7b0 SHA-256: 5af6a8c2e201a4fd0ed9cb6ee02035a7fc7054109bb8b054f2cc803284151996
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://noddy.nu/images/file/54835251494.pdf In PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6275051b07---zixekejefopaxosevan.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755405a4fc---bopunibunozakamape.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kmskvo88ba13a1n5u8t86r0gls/mawodokazave.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/21979114254.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/99971912307.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/3253580141.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3eab4099---33565285946.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55db15b97f---51563820767.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760c70a33c5---76994003048.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/97297258333.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/jujivo.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/nipavozarida.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/69148671562.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8kh8nl46tvi6971m4h60vhmnh2/sulerezafetadukegarusepo.pdfIn PDF document text
    • http://didula.ru/img/file/38196363213.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/870557581.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wubuvilefuteduxaxes.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/31626436954.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ae09fd38b04---4277937171.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/72690982087.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/79007789253.pdfIn PDF document text
    • http://ligneus.hu/upload/file/wipep.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73acb0ef94---804711033.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/junukemapoliv.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ugh60fc2rd7bhev5gp4stksli2/37923374102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=colorado+dmv+questions+and+answersPDF 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_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 18080 bytes
SHA-256: 82566c6e78abb0d8055bdd4a6a85ec61574e7fe34a0d5d99175cd68c20f20bf4
font_02_sfnt_off00013e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 10840 bytes
SHA-256: 52f077d6b11e6940990f18e39c9b02764ef3978e60a75f005d2e9ef1211d9726