Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98d5753937fea12…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 22:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27b9b38ad384a4f973fd0f3de0dd1d98 SHA-1: f56d77f56130542c77fc8bfad05a3d5789d158b9 SHA-256: f98d5753937fea121e178b63bc29fd7ab2a015eeb5dc546781cb03622852d0f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an intent to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious activity. While no scripts were extracted, the link farm nature and compromised hosting point towards a phishing or malware distribution campaign.

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 http://www.mediagrand.hu//data/editorfile/tukomari.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/dkecn5au2gdodqa3eephcca2a3/jojixaxopesumel.pdfIn PDF document text
    • https://membermimpi.com/contents/files/nomixuv.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xawilopiwigi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d39228979ed---51308543475.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/47274415533.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9b962c258---vagamimeka.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7e7e58a97---jesubomixuluwovawasozaneg.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/nasadidosenodub.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/57192551955.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/fesanevozujamato.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731f1fc74b5---92910047433.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/kezoligedusovezi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16088607bd5422---54785913563.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/notibodusesuzugonabale.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608d941478a87---xexafisizexu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/17134402769.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/gumupudemajekuku.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/12561750492.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/66df57143f597838096182cc640f0be1.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ee09b2e1---vomenewiderepapogorejed.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/xosawi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee6744eed---kidararupalujujamaxe.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/1760268372.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16105dceeb7386---84323501727.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/32301678737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=compound+words+list+with+pictures+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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 10940 bytes
SHA-256: 2a002dff1cf1d576090bbfa921cea1c976f9b9e8b020f207fd47182bc297c3ce
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 18452 bytes
SHA-256: 536c24862fb01357303d0bd9d322c74cecb5fbe43043efbfc9391b370b67b0f9
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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