Malicious PDF — malware analysis report

Static analysis result for SHA-256 401ecc95edceaf98…

MALICIOUS

PDF

84.9 KB Created: 2021-07-09 13:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 012804ccc0547783d39a9ab1f5d17d6a SHA-1: 142f8a03eaba3d6f749a1bcf4e67d760001aa69e SHA-256: 401ecc95edceaf98406eea9c4f9461bc1c946c53a37448e668f56a05f6af1bba
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 as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an intent to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=70%27s+and+80%27s+r%26b+love+songs PDF link annotation
    • http://pastoret.it/userfiles/files/vakijolosinobapabur.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/1dlavgd8j2igsqh7tdncbuefr1/sovolenapor.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a72efc1d032---93610012597.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075858197514---moges.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/basid.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zirux.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f14abfcaaef6fadf8280d761a5dc7a25/53980669201.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/46548726348.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609711b1857ca---98949251139.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/menetigutosutalunepe.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c9a78a0e73ae0d3fac9ecc054e87d152/bubizazazi.pdfIn PDF document text
    • https://zold-kommando.hu/files/38094911563.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/vscb8pfuumluh7a7ur24597c92/vewipivag.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f15363c941c987418832ea2545bca68f/xojikegagarok.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/11907371319.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/44851272301.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2ba9fb361bbf3d63ae18899b27fd6406/nipuvaguzezadib.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/gobajitetegegosag.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d2eabe34---1123878415.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/gabasa.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/worokiwa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099efc322258---dopaxixevixepuniri.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/22797175924.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/kugikakodexesivenitoke.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f6ksb7bv2mu24d9k7slotba990/goxunirazo.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_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16976 bytes
SHA-256: c29874e5566a295b6200c0bf95640a42916f88e4d2e7dada0127396067e2d6a0
font_01_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 10068 bytes
SHA-256: e53d0f607f68fb27a5f954c6017d6ac4bedae288ac4ec820541128f7acba2983
font_02_sfnt_off00012e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1