Malicious PDF — malware analysis report

Static analysis result for SHA-256 78241670019caf14…

MALICIOUS

PDF

83.2 KB Created: 2021-07-09 12:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae1f8da19cfc9d9b6f40595d356a3115 SHA-1: 876d9c7a6176c728119cd3944b8f372028d0868a SHA-256: 78241670019caf14cfa7ba9306617d4ab5148357e357ed414e7ac12c7a655cbf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload directories. The presence of JavaScript and the link farm structure suggest an attempt to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=php+replace+empty+space PDF link annotation
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/97f5f7fe15cbaf5a3627b6b5474159d4/67144052601.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/vizosekelezeg.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/lenox.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2d8987abae9d7051e32c0e1354b4625f/fotuxujivovupujivulotad.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29886920d---93321707730.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ed627615---bafonukejukoxe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08664f0fc---89716263288.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00dc624a92---46383860655.pdfPDF link annotation
    • http://belst.by/upload/file/bevolufat.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dd815b9c04a1a537c311e12f8ef96fcc/56886094715.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8271b8f203e11390eb3959ee1280beff/92655247049.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/59738518031.pdfIn PDF document text
    • https://tmtteks.com/files/61583242732.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/84df9a76e3a02bb3f58f7d5a4ac876b0/lotejowuwewewaf.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rejozugezovam.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608687cab9658---fixoviji.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/72314590419.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210531144744_825955780.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/zinijomolevir.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/23831475137.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/30860331911.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ae699ee9d995560ae168524a0eb06805/biped.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/63113410401.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/jufimanewododiga.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b56abb5a8ec---binolokiforufokofekow.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/g2kjd9sv5965sgfk45e18t40gn/41198745575.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f3a5b474838e8917708a9faaa41b803/newobigepo.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_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 10440 bytes
SHA-256: 40d591a3f98ab68165d61d995a916e9147326d7bd76c3adf92c8e63abbf323de
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 17676 bytes
SHA-256: eabd068c55eb8f811e82d0461698b5686dd3c381d7149270a07bbdc988605db5