Malicious PDF — malware analysis report

Static analysis result for SHA-256 159976ab917e9c23…

MALICIOUS

PDF

75.2 KB Created: 2021-07-29 20:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88c2e2f1b859c111706e2a734855cd8c SHA-1: 66c2f57095ca91eb23b4f78f452556bb17afb218 SHA-256: 159976ab917e9c23a799d5ea8c92e56eef1d072c33e9b23a6460abd77f239286
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to numerous external URLs, many of which are hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and the nature of the hosting suggest an attempt to leverage compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dianacb.cz/userfiles/file/xafowizes.pdf In PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/gojimodekunipuxekow.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/sogibupepaxivogu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/95423634037.pdfIn PDF document text
    • https://olterus.info/contents//files/30343870509.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/90669673064.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8kmgsfnrp46l2e465erhd2d6nr/8286293214.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/36256c51da035945b518a2ac4cb34be8/welufazun.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/90007174759.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c2cf7b030---57902363914.pdfIn PDF document text
    • http://fruitvita.com/files/files/34771318167.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f21f7a9fe29a0710178cbf192d333c26/40935542353.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/78fc4500017001a18797ed8c1169bd5f/nusisodolovetix.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/kigomuvabusiwizedozoxeto.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/51799742438.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e00b18d9998ce235e2caf49bcbbb010a/53366229706.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/880f06f3eb6f5806c58bdfb8c5558ffe/lukixenepazubofilipa.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/zukifivopame.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c175bed336c---55210442663.pdfIn PDF document text
    • https://biocoils.com/img/file/xutet.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/kuzeji.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/njqseehrgefe3fg6hu2qddrr2f/65854608460.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/xojokepu.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2405800b015bc29fa7229ddafebf67a5/37199573357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=normal+distribution+word+problems+with+solutions+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_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 16012 bytes
SHA-256: ec3e27babd2b33806616898a8bcfef9ba512a05a4164daca5f15dedfab088f7e
font_02_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 11068 bytes
SHA-256: a344a004866c264e9ea079d0b16ab9d32e86d355951f0fb117b56b520be5b028

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