Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e0825744d3a826…

MALICIOUS

PDF

90.2 KB Created: 2021-07-25 04:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a7c353b652f1f6b7f7147f994fcc3f15 SHA-1: 8adab4c86298781a27effaf07fd79d7dcfbd0c38 SHA-256: 64e0825744d3a826ddf8e1001d06e3fa48196c07faedd58321480aaeb3008307
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The document body is heavily obfuscated and appears to be junk data, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2013a7e8977672152d35f9b888cb9987/71216423192.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c15189bf---ledusazuruguzavuvosofexid.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/22305753565.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d9prt4mmgekv45cu6gbd9sm8k2/pabudumix.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/64272814779.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4428ab14f---zugifixemodidomora.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/sovulisaj.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/38994527918.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/32eda2cdba59a4608ca2bdb0c723fcdf/wujetivuwuzetize.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/wolodusuporatap.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/b610ea2aa7fc080e42c7a80af3de67ee/tisefopubewawuru.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/dibetijisuv.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/33963108196.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/38755135429.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/g3dq6r12j861hhip8b81qh00o6/konibamenud.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/da103a3006748200d5551b2b7c9b882d/falezafegojepovok.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/04ef8427160a69ae1abaf9d305d8a394/55893879576.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/14437875509.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/lapunaz.pdfIn PDF document text
    • http://abnicum.com/files/file/54116465762.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/257b97ffe3ee8974e23365a5b028935c/pinepolilitisivawilasivor.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/medenojizifivogutuverunij.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/32488817285.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0432f44c---tizilosadalute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cuanto+es+3+1%2F4+pulgadas+en+cmPDF 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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 18840 bytes
SHA-256: ec4f05f173b220a66f99a166bc392071b812d138bdd28a67bba6df6de2cf8775
font_01_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 11132 bytes
SHA-256: 4895618e87b7efd84651d069398be8fd475591266c4e9bfa8baadc97f9971466
font_03_sfnt_off0001415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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