Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb90d1dadd70082…

MALICIOUS

PDF

72.6 KB Created: 2021-09-14 13:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25aaea35d2b7cd468ba8f28ad02781e6 SHA-1: 0817918f5a6b40cbe73e0674d59f0ebdbb02061e SHA-256: dbb90d1dadd700822018e5ec4656be22c13ae86a1aa63b8b7b73a7d9265ae0d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

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://netiko.ge/img/Data/file/bukebewovisujakobominen.pdf In PDF document text
    • https://condominiovillage.com/userfiles/file/tigemoveseje.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ca9b2026---femeweporinikoru.pdfIn PDF document text
    • http://freeorden.com/media/file/sejavevogaze.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/23840105336.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908032654.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/3100089200.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b5ac9a81---3214218766.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/64258877490.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/80687348468.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/43924098425.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/12604042355.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/2804551443.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3e469647f---nufurixexegifozosid.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/50049665824.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/25528141641.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613127cc5317c---nanakizivebojaforazi.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/fotezalaj.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/nusag.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/buserisizelojovusafabav.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/rezeluvizat.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/xewurow.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/lelezuxijenatarunorabej.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210902130933402728271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gunship+battle+para+pcPDF 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_off0000b87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 10632 bytes
SHA-256: 3a8a15f57441cf61bcd69e8159612a41710540c192844d772c3c800cff30b6bc
font_02_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 16696 bytes
SHA-256: 143692b7182226d204a45ba248c30676146eaf71c6998f0e606baf05ac808d69

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