Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57df44da7a17cc5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 20:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7588baadb8001e41342fecb5b85996a2 SHA-1: a6b85d0143d2458a22658ef5320249dc882d0161 SHA-256: a57df44da7a17cc54c83d0bc24a005109ca906fc254715ffb2add0acdf2bc6fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://crewmak.ru/uplcv?utm_term=happy+wheels+2+download+pc PDF link annotation
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/54197894216.pdfIn PDF document text
    • http://oodow.cn/upload/file/210909132315109578l9e7vh6j16jv.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/50769c67c8f16c4c614478482e0ce63e/nametinosefiwegajami.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/67326870176.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/xexaroboni.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161390d404b233---78569291678.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/24320f63109c61d0ce817012c055efb9/26187934164.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fomafegomijanugow.pdfIn PDF document text
    • https://mihalex.by/files/files/jigurinu.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/bafedugukidex.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/32146516528.pdfIn PDF document text
    • https://thepainter.asia/upload/files/riraxat.pdfIn PDF document text
    • https://maisonforville.be/documents/file/26090444210.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/jaxitapulelosexuzusera.pdfIn PDF document text
    • http://apicn.net/upload/files/22457795327.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/64780450051.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/volesefu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vl3704sihnf5h4vukcfduf4jpv/dajoka.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140135b8c0a4---87753766889.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a51245be87c599e3149e2aa523f888fc/47185836102.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/josozizipivopabegilaban.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/negapamoregijagelivomevab.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/loxomizemibekoligafoxun.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/17431118353.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f215bf764ec9a7a80d1e34e68f63493b/vuduvavituxumovalakoba.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/43340931569.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/90984987453.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_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 16184 bytes
SHA-256: 62b4bdc3e94994d46d573d0cd4225b6832f97464d6ae5b90c82b4dc03f9df5b7
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 10632 bytes
SHA-256: ac5d7ed34135f6d00d0db86e24cf0e2502488c77e93df75ec7c12cbebc7a192f
font_02_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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