Malicious PDF — malware analysis report

Static analysis result for SHA-256 34db426dbe697e63…

MALICIOUS

PDF

70.0 KB Created: 2021-09-13 18:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9afccc08962933835ec3378d97dc9669 SHA-1: 5eb4646c936fbd8bf73f350db38f13fd93020392 SHA-256: 34db426dbe697e637d246fde3e5164eecf7e80381df2c22a87bfbcd8b400059b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect the user to malicious content, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aa8d59387---wasobuvuku.pdf In PDF document text
    • http://scantech3d.com/files/15267834059.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/95391673500.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/vebakunasufoforil.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/19555677324.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2d57d73dd909ed945837bdd94695a168/bumexarijezo.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/29474786421.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210912062119045.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/wonutukikizetozigoseb.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/xikozu.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/1816409273.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/76d9cf8ec37cb68a80dbd481346fba2b/62322842689.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/nogigofivojobupewag.pdfIn PDF document text
    • http://espokebar.com/uploads/files/20479465777.pdfIn PDF document text
    • https://keongracun.org/contents/files/59764004590.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/5718881565.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/liduledapakimugesireluj.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/38891547812.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/xarif.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/47347769089.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/bujositonedukugopunaxob.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/2679013771.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/81427203166.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/xakabo.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/zedeso.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/momoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=malware+blocker+chromePDF 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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 10344 bytes
SHA-256: cd2a3ca77cd70d12c8cf0e3d39b870c643af4dfa8555107f0bf9d37e21badb2c
font_02_sfnt_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 16148 bytes
SHA-256: ed87302106c397a0b9392ad3316bd190c2569cf0513a7ed14207c961c1d8288a