Malicious PDF — malware analysis report

Static analysis result for SHA-256 8552a6c4715e2a30…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 03:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d150dca3a2868d098363cb12e5528af3 SHA-1: 8f6db340d3bf708666c0db7c7ccedffca635fdec SHA-256: 8552a6c4715e2a3052a9a621207d3f3f3a389536f4a03990b84596de463d7a03
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://gchs1966.com/clients/2/2f/2f663f305105093038a7fc4b193dd8f8/File/wojasututojugowamivirokir.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098fb821f371---48977586355.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f0c02e6b1---55620840329.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/c1p6emmpj0mqp175bp0ih2f4fl/zobidexutisaxulan.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/35045954128.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af8e62151---gufaxibimuvazaxop.pdfIn PDF document text
    • https://taperagi.com/contents//files/81897897459.pdfIn PDF document text
    • http://dothi.info/images/files/vadenebiwavosubetepus.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3b385ab1089fa8b37272891fb6dc329b/57015665152.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hk9dic7knh6al2urlr3vv5aia/33188667449.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a175c8e2c3c---nabegavafuxolofokotubi.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/jasuxesoserototinezokip.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/denutafoloxisukafofe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fejoba.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/78737340563.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608030399ed23---xijoxoloj.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/517d7d57c1b3d63da4b01ea78b943b85/52024927917.pdfIn PDF document text
    • https://stauber.lt/images/files/wubugiwiviwajapil.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sj5jpto88pp4i3pave7i1k8a46/falukop.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/9493682870.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/98761813468.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/54a505d47012b96f23eccbf5f9be2e24/99010929559.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/ralijagujotanuvesubagasev.pdfIn PDF document text
    • http://modero.vn/upload/files/witepasiwiterosaxesoler.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/51922620409.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/96qfvdkp2bnef96tdes66lp655/76398382500.pdfIn PDF document text
    • http://gchs1966.com/clients/2/2f/2f663f305105In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+curls+stand+upPDF 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_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 17420 bytes
SHA-256: f2a1ef415235e152dd6ede0c83018b31dba83e05e17a2e30f506909db55b4478
font_01_sfnt_off0001365b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E72 10852 bytes
SHA-256: 5c6697d42570fc739912ab190dff6e41204d313a5a155932037b00f941ea64be

Open this report in the interactive analyzer, or submit your own file for analysis.