Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d31d196505343e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 10:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6537a2955de6b635ba99a533105cd7f5 SHA-1: ab67409775721a33753920c01fba60c8a2e78a80 SHA-256: 38d31d196505343e435ac9679c0d963cc5bda2e5d312243105d184ea47450ee9
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. One URL specifically uses an IP address, indicating a direct attempt to obscure the final destination. The file's structure and the nature of the URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5e604c0285bcd6ce447572c2458a8fc8/latavekifiki.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160747a2010aa7---72481574160.pdfIn PDF document text
    • http://tms-operation.com/upload/files/kirezulu.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-6/file/2021061223103773499.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/56605993814.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/68139198945.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/xumofuxuvobi.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/foderakob.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/sodexurab.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/89047276651.pdfPDF link annotation
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/kdughv3r2reb774ulripne9pkk/salojibe.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/c00a033c45ec1b8f60d0bcac8d350753/87823496601.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///puviwitodofopu.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/13482871699.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4ca76a17156c5278787f62b251e0464f/fifesijuguziwiporelajatan.pdfIn PDF document text
    • https://rajaunited.com/contents//files/nepuluwemulafap.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbadccd1a8---tasop.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/11025458862.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4b0734df8c76db526fc5969239753c41/67907846956.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d072d2f0f---denazugaxegebilazazizosa.pdfIn PDF document text
    • http://akssert.com/userfiles/files/jebowojujekeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ssc+gd+new+syllabus+2018+pdfPDF 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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 11400 bytes
SHA-256: 785d3b725a70d84765ce877020caf05e410602580443b338631542686faf43d1
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 19600 bytes
SHA-256: 72737dc11025acfeba59088dc9b20075ba1e414a8d92ba88779cd5e324beff6a
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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