Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34b921cd37bcc16…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 10:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8ffac7ae8d76153a7c8668d92476cf5 SHA-1: c2cee77b2fdcd992641663758ecd05b45fc61620 SHA-256: d34b921cd37bcc161ddab5769647687bbf490c2f0bfc374333a578777885254c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body is unreadable, but heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. This suggests the PDF is designed to lure users into downloading further malicious content, likely disguised as an invoice or payment document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mid-europe-ex.com/gefaboredorakaporelazadu.pdf In PDF document text
    • http://wowbond.com/upload/Fckeditor/file/tenowejojaje.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/tutem.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/74955409998.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/3628850002.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/crr2ri57vpddgahp8s0demi27n/lowaxem.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/xalogudi.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/silelo.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/retunifudetezipopobaseze.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/81182171196.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/ragijisowoseta.pdfIn PDF document text
    • https://ovalpolycoats.com/media/9845196776.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/48187287632.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/remujuwujagefilijefa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3jvinn6t82v4slk965aetgn256/79869870297.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a1e2c330---80805011029.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/vupavivova.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c3941f36---dupujomabuwejebipubimo.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/3002688997.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fddee9beee---87555246809.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e2788b4b---51157493224.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/mofiduli.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/rugixaxaxe.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87da69196---zufoxezoboxuxidunewupo.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/50244235270.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/medaniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=aiag+cqi+9+manualPDF 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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 10348 bytes
SHA-256: a32f7d74d2e5623f526d27508277e9d2bd4510c8b9857e5c834079e474abc80d
font_01_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 17644 bytes
SHA-256: 9e334960cd48ff28b375c23d2c806291f8edd662066b34250a3ab1e5d83d471c

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