Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f38a85443e2cd5e…

MALICIOUS

PDF

83.8 KB Created: 2021-08-15 06:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d71fd69421f0a9a450b425d36908337b SHA-1: 50461c98707e919f9fd48a124d1fda40322236c5 SHA-256: 7f38a85443e2cd5e5fecedc5ef26902737d345146f461d6a361deec4a6ae2432
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to compromised CMS upload storage and disposable hosting sites, indicating a phishing or malware distribution attempt. The primary IOCs are the URLs pointing to these compromised or suspicious locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ashioke.com/images/library/File/11203879766.pdf In PDF document text
    • https://adsbudget.net/userfiles/file/sivufapafowevemi.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/kabifilupezuwozipagozono.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/tepaverewamig.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/10b6h83g0l6i3c8jbi8aagtf27/xugulizigevuwaxomiferi.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/f0fda3aee6b422bdaba86b445883ee1d/12615176834.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/palitadivikuk.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/lovumegufetomojabajutuj.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26429a84d---42724103958.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0946afa44f1b0dbbbde94f40e057dca2/85671003222.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/89719887975.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8baf9c24db---liligugilularudedimul.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/6opuuu0ntsvrtqdeiaahhe4d96/54146414302.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f99c20eb75d---jisepewefugilokiravekod.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/sovedesan.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/602481339.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/40529654602.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1b87739f8551bb93384d8dd212a7d842/leloromoj.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/83521945365.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/23014053312.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/rakomuwofelirolumapiviva.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/kekulerakubimixeli.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/31329013601.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/27647111769.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/16ae9816b9087104ac41f7cf4f625c05/gobage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=animales+en+peligro+de+extinci%C3%B3n+en+puerto+rico+drnaPDF 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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 18064 bytes
SHA-256: 49aa23420ca83fa29a970207b4a63e2035cffa8d1b4b38b45afc02a092c63db8
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 11180 bytes
SHA-256: 91a7e599e1ec50b3dc489223c872e450090e6e8b952747e6d24d3f5e68d0100c
font_02_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1