Malicious PDF — malware analysis report

Static analysis result for SHA-256 204391986e571dc2…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 00:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fbddbef2398fe27f4b49d9ac841905a5 SHA-1: 4b7f6b514f2d2e43def78750368dcecebd2610fd SHA-256: 204391986e571dc20905ddb3fe3c78bf1f3f3248f7353d38db9f2491cefc1faf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm to distribute traffic to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=gangstar+vegas+2015 PDF link annotation
    • http://studiopignotti.it/userfiles/files/xigitexiro.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/bitudo.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/25211980659.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/petabida.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407f404eff4---xefutidakaxekatedidanurid.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/44435725654.pdfIn PDF document text
    • https://svltv.in/userfiles/files/wemododur.pdfIn PDF document text
    • http://contelex.it/userfiles/files/25340872742.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5e0c1e7---3480198787.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210916071956.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/javulez.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/71614509359.pdfIn PDF document text
    • http://tano-cable.com/d/files/tajumefepaporonivajogoj.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/32541843264.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff13253f8e---74079348910.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b92f3ae823---zufir.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/22651172824.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5f15d97d9601061343c093676caad212/kevebufaruk.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/lifufipiropuzolebebine.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sksp1mfmepsm9fc2m5idfatusu/1647684754.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/ridek.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/kajesilurir.pdfIn PDF document text
    • http://cloverdiamond.com/file/67890073036.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/20186393159.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/77937910162.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/dejedakupi.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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 20288 bytes
SHA-256: 82e265038117665b4d937dbd31ccc172c636584a4db1de09b09b095f5e410bc2
font_01_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 10556 bytes
SHA-256: b48d0facbaa0eed9a6e03fa9112aacd9d6198f18ca536d28a4c4a8c3ae08082b
font_02_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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