Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b68d7394239bff…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 20:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 635ee6dbdc66402ae798b773724e0d9b SHA-1: 4da89ed3a15df2743dd88240511d8a3f50c77a59 SHA-256: 36b68d7394239bffc76584e6e18b47698c890dd6a176db1fbcce0c763c4608d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external PDFs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7bada9b105c72ab2855f0342bfd7c2bf/jikoxagamamodorubaduwozon.pdf In PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/29127693426.pdfIn PDF document text
    • https://shidoremicrosys.com/media/71924474178.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/59dad268e9ea60108753bb31f7aa183d/87473990369.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160931cb3b484c---69558351142.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/xusajamesiriwifezo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nijalukeg.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/susesokitemima.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/dumifexotabif.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nnr6d6054i633hisru37ts3gb4/jusemoniwuwerub.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/55420785467.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/ferifujutifulomeraperob.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc94f1383db---noxafefepigavumulipedatur.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/39077279615.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/67610264847.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v9g3s6t7p0rv98bedbol38c4ad/zuzarepoleneduxu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d99c065c21a---vavobevajo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/xakalubopuduzasula.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/tolubivalipewijule.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c066a347b97---doziwinela.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gapawukopofopijekulo.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/mujuvam.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/wiwafozupawizenawutol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=auditing+notes+pdf+ipccPDF 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_off0000b2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 10568 bytes
SHA-256: 3c304701a0a9c44df9514aa163fb2d2426b05dd23a37e688835d18c6caa43171
font_02_sfnt_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 17316 bytes
SHA-256: 1a1d1a6d539ae48beec73dd353a7869bcbaedd79ff61e8c69cdf041fcb9a0fdb