Malicious PDF — malware analysis report

Static analysis result for SHA-256 2646e17effffda3f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 11:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71f20c239d9613b00786e0fdfc1b0c12 SHA-1: 0d2b6fd99f7c1a5c555d962c220609b698b27bf6 SHA-256: 2646e17effffda3f826db521045e4255ec68faa1a29719c96a68cbca4873dc50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised or disposable domains, indicative of a link farm designed for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=normal+distribution+mean+and+variance+proof+pdf PDF link annotation
    • https://aedwea.com/upload/foto/bugudulafepiperalebo.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/zonilikabid.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/38270951448.pdfIn PDF document text
    • http://foodchemsino.com/d/files/popesezebazudami.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/586b670335c12bcee3497cc81dd41326/daxuwija.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108301421511611.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/tusifasodejevipekaboza.pdfIn PDF document text
    • http://c-amc.com/upload/files/xubuzomozidavimegusowisak.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/jovofutuwanukavitukinorax.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f7ce2d05---39818860721.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/dupurelikus.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5937659a5a---xuxedunadakaluvuxamutolen.pdfIn PDF document text
    • http://springbook.no/files/22096374828.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bb32129b2ff---wofezivojaz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e952f18ac1---14284760514.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fdd765978bef43eab6e77e23f3068396/dogazumezaxukil.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff4adc346d---84689707622.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ailg1jcg5krn4terdpv9lid8s7/wejesapanelabosowor.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612de46d75d2d---32696949579.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8693b9163---zajozotizemamefoxege.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/jujafunanuze.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160784981e290b---83499388732.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16088775dcf4b6---fixumames.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ees3iq7c9eqejhhu6d2epdvkaf/18255177821.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_off0000d065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 11064 bytes
SHA-256: fc38472841b962fb9ec98aa63ec9d48ff2b986aefe67debf23226657a46dcee0
font_02_sfnt_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 18120 bytes
SHA-256: 4fc32f0905fa3db099bb06300e3d1ec74f6cff1fcc73412013ffb683d66eef50

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