Malicious PDF — malware analysis report

Static analysis result for SHA-256 9265a02d7117f19f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 16:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4650e88b991dd8e34ed559a4bba428fa SHA-1: a303ef71a7a073001bee08e776a71bea4fe9e6ca SHA-256: 9265a02d7117f19fc3d9991018a24ca7ea10c8465514c81e653eddd6479c5dfd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites. This pattern suggests a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7c1296e6---meruli.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/eage9gemc84akt1tnlq7k84qj7/mexadinomuwuwajo.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/fiwodetujodovurevupujew.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/74630963233.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/vg276f8k9cerutc1er8o6n2088/39859622460.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1463102dbb---rozoviwigojunobogifanebuw.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/pokojovemuwenawederemepa.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/33345366495.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612c4dc89148f---salolazafezalatigazo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/4394978170.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-13/20210613132316234008.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/9751836030.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/550e24bb2ef237392ff73861d4b96e48/madasup.pdfIn PDF document text
    • http://sukhabalka.com/files/file/xanixigivejemogu.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/gabajagovugadanubi.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/17672168317.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/vabejamopefudukag.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa26223d130---41230972606.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/24041675254.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/jajufevoso.pdfIn PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/pejux.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e239b0156---82984976556.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c4a592cfd9bbf5b6975ece485ab71e2b/mufogojovedorekidadulok.pdfIn PDF document text
    • http://keacg.com/upload/files/17322890025.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/pewalibupoxidujitigisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=force+app+to+closePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 17592 bytes
SHA-256: 6159dd19a0c1b3d7d1dae853c81ce5f097651278234ea537b50729f10754a02a
font_02_sfnt_off00012f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F02 10148 bytes
SHA-256: 09cbacff2028e60cacb8066149b1edd8d4f9e5d9356010744886f120a7ab520e