Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b9d42991c218ee…

MALICIOUS

PDF

83.9 KB Created: 2021-07-31 01:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 24d5decc429d7318cd9547a46e8cfb27 SHA-1: 6b2d163388da91a2f422bfaf2fb082d9ca026310 SHA-256: 83b9d42991c218ee846d8a30be8f17084928249148375dc56028f1baffc569d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to lead users to malicious content, consistent with phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=fractionation+method+pdf PDF link annotation
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/62227256670.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/57328048475.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/64687743270.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5896fdec31---31730695602.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a5e87e56---16209156507.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/80485925509.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/251500671.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/tesobokesudigisezaluja.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/72897770669.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pe92rl23cvr6ief1sua6jmafqb/67561696949.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c79be238b136b6882d2d08741a9993d3/9900873865.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/39ne2end11urthmbop038m69j3/77430862616.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/15101969371.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3465be3f---wozenugejoseruxikite.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0813075399---todexufidokoxofix.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/45241810742.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/suruxorirugojos.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/dodojafapeb.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1fe5a51e---rizagisofuwukivobexuluvup.pdfIn PDF document text
    • http://aweibel.com/Photo/file/taronu.pdfIn PDF document text
    • http://dothi.info/images/files/30181837969.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab1b6921b---pedumixazat.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/62930103823.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ca68a7383ce9552808209aeac96a5983/bebugoduxopefozawoli.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea9e44f6f7---jiripumi.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_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 16548 bytes
SHA-256: 70696bf869ce52bf408b77b2af04e4ff0598266be1a03c8a92e3fea56b3161d7
font_01_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 10648 bytes
SHA-256: 549fd0aa33e1bac2c0c4c6730f8fe2408aaeb924de755ab80facfb7836f640bf
font_02_sfnt_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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