Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1a90ae164322f1…

MALICIOUS

PDF

71.9 KB Created: 2021-06-26 01:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7db00a4881a5a551c2a766c060e9891d SHA-1: c92d5fbb570af6c7061da8021817497335953c50 SHA-256: ae1a90ae164322f1c1181878197f10887aebbe5c5c86b3b944c152626b1a986f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phish users. The PDF structure itself does not contain readable content, but the embedded URLs are the primary indicators of malicious intent.

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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lv27ddkjcq4d890dd7l0ufabsd/simemenasuluzowo.pdf In PDF document text
    • http://altinay-law.com/images/file/selovogazazasawujimuwe.pdfIn PDF document text
    • https://wrd13.com/force/file/46502633172.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/31130125227.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8c0c2a02a84f101aa0365bc56de5c78e/67920342966.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b5b331e6ad7c04f048a8a80241a25af7/4750142580.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/opvlc2vq4hmogn96p9rdmg9314/23355665248.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce2bf40d27---poxoxazek.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/sokubibun.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/36887758800.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/71526579869.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mesulorugurum.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/22b9b00fcb924e9917cef89413e60427/kitupetilexukosugife.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/68284832044.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/24f6d8e0ab0d0b17eec57bbe95e58b64/92927229750.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eb8d7fe2b---teninu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vkldlr0qmcckg20cbmmturbqp1/reloxabalenujulomu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e26e18fdc---66575263512.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/juzoduzod.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/e1n8otn3lm8qq36dog98qmmgb4/45286982931.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099985b9b08b---18047001361.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d935473dd8---vekutefiwefixa.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/98595529930.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/32619430885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=two+types+of+system+software+arePDF 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_off0000bb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB24 10440 bytes
SHA-256: 52012c513be8a5e6c1c30d63433d34e16d57c46968ffe6d56a8f9b5a9517ca41
font_01_sfnt_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 15368 bytes
SHA-256: 0adb37a99b5e6d13867bd75d2a25307063e73769a97799736aa82e8551c24200