Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d2899523b6cf72…

MALICIOUS

PDF

70.7 KB Created: 2021-09-04 21:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2bee4af0001f0fb8a839fdc4a551211 SHA-1: 9f59e08ca2a8dac4b88b9760e6abc1de90d55c48 SHA-256: 98d2899523b6cf723a64f7d78b3f97b54202e168998f859c9137a723b8f0daff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gatewayhotelbangkok.com/upfile_hotel/files/mijuxubesila.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tk3d9cc0lg0ah1kkqee1cc39h2/fuvaraw.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/bemejuk.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/zodovavazijakujoboni.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/66161791553.pdfIn PDF document text
    • http://yuli-china.ru/d/files/refevikop.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160877400093fa---xewivifovup.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/18982359042.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fab29d4e83---46584997708.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/gobodunavazatov.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdda6cf54---tovimi.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/56311418115.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/hcthkoi8tg983kqa65kubseqe1/gozizufomodufuputarukun.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/ripozavuzavadetusiwada.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/852b35cc6040880c110debaee4c486d7/23231092264.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/38807929433.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/529d32a6304b30f1f27e2b2414e51291/dapelawitifi.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jjgscijh6e1gk3f7pt7819ds4k/36218907286.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/39442931502.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/miraretidivekidin.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/wilulemup.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945737063c7---71921785800.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f9625ae13a4---54400529422.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a558be1f7---zanijuwobisadofuxunexan.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9f36dac8e3e5e42323d7003e92efe989/fewuxodenasovojilenuzipez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ahle+hadith+books+bangla+pdfPDF 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_off0000b694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB694 15076 bytes
SHA-256: cca68dde1fdbe46122f80ab7449c10af5e08e3c32b2c53b9a8770c6df326835b
font_01_sfnt_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 10892 bytes
SHA-256: 38db86579b48ab1969f6eeab48b3e6d699dddafff4928db49afbdc00aafc9a90
font_02_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1