Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16095a51d75f436…

MALICIOUS

PDF

88.6 KB Created: 2021-07-22 20:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b31202ac68a790fb35e8cd936de9682 SHA-1: babd85908372e4ceb5aa5c634c53a0308383ab43 SHA-256: e16095a51d75f436514a65712bffdf93322f3932fcc849850cd7053902219ce2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads or disposable hosting. This suggests a link farm or SEO poisoning tactic to drive traffic to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://ketoanantamhcm.com/uploads/files/82028802385.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jggo0mnvbbmm4i1ia7478e0qcn/dawesuvasisorusar.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/86681788153.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8af2d1c0621af517cd5e13c59945d71f/nemanewaruvudami.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/womirelaxamemud.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/3295769231.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/aea6bef6b54fc4d3e59a46d1a02847d3/35143162745.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/74411718353.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/xugef.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468aee735e---tagegodotovuvidapajugowad.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/mucdtofskv3shg7thbiru0nicc/67852075165.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/32732964163.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/30378332248.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb545303c0---86602887720.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/65637324838.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/62136630243.pdfIn PDF document text
    • https://mollis.rs//files/timakomonewo.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/dosuwubalob.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/fiworalamexitaragipom.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ccb5c6344---gubuzafesuz.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/ralavexelufivesebajasiv.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/pulukiwixo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098771a4af07---lujopi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/m3prgegjtmr45khjcgg91temc3/kujupemudawedijimiponexe.pdfIn PDF document text
    • http://cochu.net/resimler/files/bejabojoruwuxebufegafo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b297facb---veriweze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+analysis+and+use+of+financial+statements+solutions+manualPDF 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_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 16684 bytes
SHA-256: 1aa061083578e7ff2d8a6dd1dade8e4f3ee773cdc7f94081b8f50a64f992c634
font_02_sfnt_off000139cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CC 10820 bytes
SHA-256: 0b597152fde05c7a44ade41497c3bd7fd13121a3fc3816b486b1908faa42d74c