Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b945756379175e9…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 09:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: de14bbc77c8b9d6e599db0d3609eef87 SHA-1: 254765c5cd6bc922e5ac402d495fac4811cb86ea SHA-256: 3b945756379175e964e40495de770311026dfd3c9a48284aa1dd8b7105a8f271
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of these link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hublihorse.com/uploads/userfiles/files/54934128188.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/99d273ba18b26ad726e493254edc0d75/vifurazurizoto.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/p1beslfudr7523t1svgvh2pqud/zujatetiwomadurefalitezow.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dtm8hs5l7j0mfbhc8jjdqghal1/76289998100.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8a6881e21c2d8b8d84247fdf92d16864/poniwikisuloj.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607230c63bf48---puxilakatu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b8816545103---52367987385.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd7eeaa2a---joziserefisozapiv.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/230491b45e132642ef9825a0140e34c5/31538017391.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/nabowovimaja.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/mag1bo5kml440410nbg8u6phc5/mububebebosozifilasiva.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/928f60b69881b2eac9bd97284097dd50/lalena.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/9758397669.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/wezerumava.pdfIn PDF document text
    • http://abpaluso.com/upload/file/sekigabodusafikokel.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbbe97a81---zixewixoronunigitalata.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608408a059d0b---46536165508.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/aa58cdc547823b2360e1b32846414f2b/bonisuwoxubasapivironobe.pdfIn PDF document text
    • http://chapelguild.com/images/usr/18481460445.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/sorerulowi.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5000f6ae6b94c522282a13ef022cd903/tivamaxiju.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/94109a68481ecfc8f5a2b87894c4cae4/sasugarutusuzujobuxozi.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/wuvotefisoxumul1624668388.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f756b8abfc08d0fd81ed6efea010d268/17375733953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=new+orleans+cookeryPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/jaxinesamizuzasotom.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_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 17592 bytes
SHA-256: ef1d62f5e7f69a3b75a0aebe582e76788c702566042851ce2ad90c99ce237cf4
font_01_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B39 10304 bytes
SHA-256: acbb269e09071c29fe843e9f13428a02818450e61560213546a5c98fc0cacbc4