Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c442418adb3c42a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 09:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5226dbe0072b9d6a3d1cc07e74547cc6 SHA-1: 910bcfe5e9b4d106d49a2977a6f903c1976b0409 SHA-256: 4c442418adb3c42a04d20da8d38c4dd26c8fbdf623ec16b33b77e56e44049231
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains. The primary purpose appears to be directing users to external sites, which could be for phishing, malware downloads, or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=super+mario+gameboy+advance+rom PDF link annotation
    • http://househouse.it/userfiles/files/sunomenikolan.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/voxilan.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/9453265386.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6c29103d---82916173633.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210916/file/16317271851486.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373dec4520a---gisibaxavikolom.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/kidaromiwadegujaba.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3453e4e3358fa56659487adb67dae30a/kajofivutasire.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/sulemaledaneduwa.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/30816103045.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/43d2368fd48abfe50a52c80964e32e8d/mofasazeviwigazefowuk.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/sorajat.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/4449042443.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/53365419695.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/25621334199.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/kebedutiferegorixafov.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/48276732482.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nsa68hhlmla0jcovj9j75hum2e/2211855934.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/22563876872.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/770ac4c546b0a7f4ea9da189ef76d406/74690208853.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/fajuzuje.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/69493491034.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/xubopesatovibivofo.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_off0000c35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 11040 bytes
SHA-256: 6ee6423a3678ec6439b6ea738fbb86dfdb9c9c7dc734636872bfba693fc40c17
font_02_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 16376 bytes
SHA-256: 022be593d7f3ba06a8ffd583f5542e60c46afce878f27007739d46c1f43094da