Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb88a60ce35e45b9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 17:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cc2621d78e32c5eb2b5fbd660bf9ed2d SHA-1: 3711eae2d3e76696734b9d632727426c7f84f593 SHA-256: cb88a60ce35e45b96e80ddbb0bb0e6ef76ab818618d017adc0e0101633619c65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d23bc5406230b550551d754a988417b/datasisive.pdf In PDF document text
    • http://ncdesign.it/userfiles/files/polelujujanagovidate.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d2a33bf4---65185771643.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161215bd0ba69a---51739911423.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/21392517436.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbcf6bca21---sufirogizojoxawowexal.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b74ee810e---26172310664.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a9a1de262---wirire.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1on2snhh19ibje7kvcdoq5a4nb/80011229541.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b027aef645185d86ad70c84df75cc62b/80686258519.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/79326030520.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f77e871eb47---99628312826.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/63681347598.pdfIn PDF document text
    • https://assistenza-termica.it/file/paraxogekotaxulunezan.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/57780594201.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108170328532515.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5dcde5416ea145032e42fe9fb84f39fd/74403821714.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/63102106541.pdfIn PDF document text
    • https://uangraja.com/contents/files/tavukufujisimenesiwodimid.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6119909d3c244.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/htbl87kl7mobshfgjhptcv8rl3/8301699766.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/favovowakigimikewuwa.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d1137d19f15e5153b8fc46fddbbd2d95/rexefonujezulipofafaror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=duotone+wing+foil+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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 17368 bytes
SHA-256: 0179eaac14b19780e7ca01b3c838a62303409ab3f0351b62fe0e8b2c098ffb9c
font_01_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 10476 bytes
SHA-256: ff9eadc65979199493e4d3e2a8d7817c67b9f3a03cf024fa115bfa69e7dc251b
font_02_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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