Malicious PDF — malware analysis report

Static analysis result for SHA-256 b420108a04265074…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 00:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2da11914a605c0ec790cf61f9ad8236b SHA-1: 1e12dfe43f7b74cbe8fc52fe3bfa8de7f6406831 SHA-256: b420108a0426507492b48f52f70f7d10580b5a340283053127ffa00a6e376f2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on disposable or potentially compromised domains. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=ethane+burns+in+oxygen PDF link annotation
    • http://gzsjlt.cn/userfiles/file/miviworotex.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/garaminixikurififafep.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/kokop.pdfIn PDF document text
    • http://ombs.ru/uploads/files/39863685430.pdfIn PDF document text
    • http://ledins.lv/cms/file/96202783053.pdfIn PDF document text
    • http://generoussecurity.com/uploads/45330579036.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/gokonela.pdfIn PDF document text
    • http://patroha.hu/file/62160476812.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/mowazisopa.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145841c38348---pofoxuvagixovepig.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/26068327672.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364ab78c693---78053731741.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614472a486df1---75399234119.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091521040373499.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/sirexi.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/tesokafupone.pdfIn PDF document text
    • https://porfic.com/fotos/file/nabeniv.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/78879983556.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c3203763---xofopalux.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/jonokosonufotata.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/10749406557.pdfIn PDF document text
    • https://magerp.org/upload/files/wukofogerefadosar.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63fe2d14d---debozovegebuk.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/87871285201.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/vuwuwetedirulugu.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_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 10780 bytes
SHA-256: 71c22e94fb731cf4972438f37fd2b73b7ac89693a1457786f9063ffd00c8fb27
font_02_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 17856 bytes
SHA-256: 3dcc1cd4068cc9c8a646ef09747f76fdbfa0a8f3410567c0cb951d9648ef39eb

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