Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da830a824d3de81…

MALICIOUS

PDF

83.6 KB Created: 2021-06-29 21:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c68e8413a9c19c52d1045050fa08a3f SHA-1: 6356a73df7f003e5afcf2c7b87574d6258828180 SHA-256: 6da830a824d3de81c28dc24b02c3ad32db6baa99bb3288fe405d3e7738bb0fb4
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs that point to compromised WordPress installations. The primary goal appears to be redirecting users to potentially malicious content hosted on these sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816f483fa96---gilubadonorefosaga.pdf In PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/b63168b11ebf7c69b54f09fd2c6ff9fe/pinanuxikesesu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a11541bc320---gililikebafivopunuwur.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/pixumepizamavukinikev.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/51067445494.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/jedidukad.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bvsf7gi84h4n2i4hp3cirb7d55/buvalasu.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/fepomeremum.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9b854256---kasenub.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aacf114090c---129202277.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/938fcd431c17e77c540806babc8509c4/78072244555.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/tudabufamojofidegigob.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/74bdf0a15964f048eb6c0343d6a70edc/13350104118.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/rejasi.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/g4mp1i2kk2iveip7cedicao9hu/pusukeragumesadaka.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e77486bf---vufolig.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b226a9382fe---22262404018.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/f2f0c9a7ef7c5981cc6b864033dab50a/84429683649.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7107c2ec---3966969445.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/posuroril.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a150fe52016---wutelonemumerujusojofima.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/mojovobipoxuweb.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc753a8009---49055844010.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0915795001620738148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jo%27s+boys+and+how+they+turned+outPDF 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_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 10672 bytes
SHA-256: 9f084788376f41b1df87fc35e86233fa9cf1834e097803b70e1b6acc70cea09a
font_01_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 16916 bytes
SHA-256: 2851ee0fb36de9c410a3ee888542ca44c7ddefd503c4e780bb65a5b583a31b29
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1