Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c277667518bf51…

MALICIOUS

PDF

93.7 KB Created: 2021-08-05 04:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29b366bcfde8380ef1bc9e5997a3e574 SHA-1: 796acf1c2721e4a76f75f827b3563893c53ac4c5 SHA-256: 90c277667518bf51526c499b395f22b07c89d35ba428985f06bd92f8bcea625e
204 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links to external resources, some hosted on compromised CMS uploads, and presents a visual download button. The presence of a 'password-protected archive' lure suggests the document is intended to trick the user into downloading and then decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/otvbh0lvpsu7g5jfveid77cfh7/xovotazomedavam.pdf In PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/89805652885.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/abcc9b015ee0b65f5630dc2df4b8a1cd/tasojenivununezekuno.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/mirupizukuj.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7c1e7589---60765875815.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1b67145abb525b89eb59db4cc15e89e0/jador.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/25064626373.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a4aadc95---10298218643.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/038d62041454c0c3079c885303acf6b8/83024038390.pdfIn PDF document text
    • http://megalaserasia.com/upload///kaxigorosodoxidepevubaka.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210621231406_esyjg5.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/kegusixesajiteraxavimo.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/88647591900.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/49398409763.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/127ceb4dee3d55717408d17f9dc04610/32708752109.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/nixujabajaposevisonub.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///22234798713.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8d40d737a6b7aa015019e3a5269cf04f/rolubebifa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ece1706a---dumuxog.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/vinudiwofuveduzumuxup.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071846c277cf---rofurekajexikozisesow.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a232633a---78271535258.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/retutotevisevovemej.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/2740951032.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d86ff424634babd54b72bb0382f73f2a/35622414502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=autocad+2014+crack%2Fkeygen+32+bit+%26+64+bit+free+downloadPDF 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_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 17796 bytes
SHA-256: b62b6f1d9446e9812663ceca890e0c22ab6887b12dd61436d11b46c80f4316f6
font_01_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 11336 bytes
SHA-256: 553419294cc86525fdaa92bc1601e51723f62cddd49a18458b2f3aa02752ce5f
font_02_sfnt_off000150bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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