Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0caaeecad1afbc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 01:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 819994bf8385a9d0beaed0503b6d9679 SHA-1: 8a880e84ff21e8fd01a608e4dfabcb718a726b9c SHA-256: bb0caaeecad1afbc602b412758ae2f05f39e55a971dcc4ffa0cad4ad3ba9a257
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on compromised websites, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The presence of multiple compromised CMS upload links further supports the malicious nature of the hosted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869d0fc8b14---mufuva.pdf In PDF document text
    • http://machinegroup.ru/img/outer/files/jarerirezapufugamavegazi.pdfIn PDF document text
    • http://berbun.com/user_img/file/845381636.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/39141321140.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/97451914351.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/79faf1cbf5a38b302bd9c03c046fe66d/zovixidowo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/21b3036ab5d70240c1bcdab50caf3e7f/lajixovetomap.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/juvitazoxa.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/nodobedusidikifowusewedi.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/tijovumuposixe.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e889205544---xinipijamefepopid.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b95d2617690---kesudupafoforaliwiwakotir.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/t372ntkfgpkflid7ih6vq22f42/40309081566.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4l0l7ucm695p0h6745ho2346v7/7925419377.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/543763bafe82457164aafc854a496d13/bobovakoxewaj.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/vipumododarexinolase.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/mewegokusosutitev.pdfIn PDF document text
    • http://htygroup.com/upload/files/liduregigu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5d6609cf35c5a0defef7a3cadd61412b/45618290314.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/11899873264.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/11509314204.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/32813209087.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/55900995602.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/3497421515.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/13198674709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kyocera+3500i+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE10 18552 bytes
SHA-256: c94ef5b6d4bfb3e3ccbd773cca6e743bc4902a8e3a3c710a15e799f94b806c89
font_01_sfnt_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 16752 bytes
SHA-256: 92d5cb149cc5ef57b37b28118aab86fae7507fe08b8bae62cbd39ab97be241cd
font_02_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 10732 bytes
SHA-256: feae796b29983c8249830ef132835cf1c7eef85147fd7fddcd303566f3e41a33

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