Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9fc2c9c73657d0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-09 09:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab24010019bb660bbd0ac0771fa7a11f SHA-1: 2402a84084903c40e17887f066300e19f4ca9277 SHA-256: 5c9fc2c9c73657d0eb63ddc1a470f5f681c09f909c8187f7c4c362443cf63482
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were extracted, the presence of numerous links to potentially compromised or disposable hosting sites suggests a phishing infrastructure. The ML classifier's high confidence score and the ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chi-kara.net/userfiles/file/78646190282.pdf In PDF document text
    • http://gainliving.com/upload/editor/file/rujemetusu.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/47521366962.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/guluvibaguwabegekokavugow.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vodesirijilubegik.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/76840223588.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/zijonudilukulisuwokivaw.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/bawuwowevodetixof.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef237a5f43---xetowumolufunova.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d8505c6e5bcd200d1aa52fb35cf1839f/26290722436.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/tidusemaponimaweloxa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/47638608376.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/bupenemajuxopeborudu.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/finoxoz.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/22821827619.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/komunixejamawe.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/vulaz.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131626a5d4db---123461180.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/56c3ohkd9sdd89ekrg1p66j31e/91416787292.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/121441585.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/28612230844.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e403b9af30b3838eb9f12ca5c129044c/nejuweximefupego.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/gazikejidojutobur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=como+reparar+errores+de+androidPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/43592431704.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_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 10440 bytes
SHA-256: f892c6f7f30bfabea46797063cad21cc2c13bf3b91542984be2a3552f1d32d33
font_01_sfnt_off0000cf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 16704 bytes
SHA-256: 8df1413fb90954d1c3ae0e81235bc953e7130164999eed68810ed0cc5485bf93

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