Malicious PDF — malware analysis report

Static analysis result for SHA-256 0271df370c409294…

MALICIOUS

PDF

82.2 KB Created: 2021-09-27 06:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f4d80856a9cadf580a8157e55df2143e SHA-1: 14aea91b97c48783c2a2242215b0c4a09e734e7e SHA-256: 0271df370c40929433e508ab3f193674943f851cd6bb7327c6f3b50a7a4c5547
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to various external sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cructi.ru/uplcv?utm_term=lightroom+pro+for+android PDF link annotation
    • http://car-zone.sk/data/data/file/naxuzazotakinamuxasete.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/75327925105.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/bijizazusugix.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/3045830518.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/83007712765.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/lerutodakena.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae9436c39---vuteki.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/serenuvovezunavijala.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/fifetipinuxitomegofutuk.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/76107633274.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135663099c90---46542683897.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/bexirozowokavamasarodezuv.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e1b69d7e4---javuretiwufoju.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/81894087488.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/39806559189.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/tewunegugabejipamikezixar.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/96010986923.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/21506078054.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/lizebakapakizetilesem.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/salipawapewoxagel.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/4475918755.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/70974443997.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/36fc4a031f0968b1d4cc39df356ee90c/lefipagoburakiliraw.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB919 10556 bytes
SHA-256: c2822b652b693464de98ff1ed8c315605a7527fb827bbcf3de173d5b64db7e93
font_01_sfnt_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_03_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 20828 bytes
SHA-256: 3b1a946cf1712c5897b09431b0ab4be73be663ae0c5eefb01cb289f5223f371d
font_04_sfnt_off0001320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320E 1776 bytes
SHA-256: 5df3691c8e7c4cbc28bd9a15813b86c32f5266304be0e6eca3494cebcd22c3f2