Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffec7c3e769592aa…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 20:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f6a53149554a7a4857cc2a856ac506b SHA-1: 6e9a10556453ca77b8069a0d5c05423f83fa222a SHA-256: ffec7c3e769592aa00af619350842823a272911086f4f7c0e1715d56d95726c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of these links indicates an attempt to redirect the user to malicious content, likely for credential harvesting or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cructi.ru/uplcv?utm_term=cpu+octa+core+max+2.30+ghz PDF link annotation
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131c516a9e2a---xisavaro.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/90166333519.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ohkvjk2doofdql1ji5pmdciq60/53872174128.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/safafizekit.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/nufaxepatofaleriwufixem.pdfIn PDF document text
    • http://schokozentrale.de/idata/37756698334.pdfIn PDF document text
    • http://maihome.hu/admin1/file/dolojodegipixonekokubir.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/66573509895.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/wakemusavo.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-21/20210921232820587242.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/magibuvezisiti.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/60401299080.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/jikotemiz.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/62571234259.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132764a7fd03---21504579938.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/xopeluw.pdfIn PDF document text
    • http://rafaelokazakov.com/file/vamoxover.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/daxadodaporalanip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354bca4835b---liripaxu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/076fff0fd82b9156983db66665eb5b9a/14001327775.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/84262137943.pdfIn PDF document text
    • http://rooptex.com/uploads/libemoguzewipaliv.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 11184 bytes
SHA-256: fea1e32f5a8561c8c4225a09fc0be72c3bd49e7e47a9c47b7774f6984a57c369
font_01_sfnt_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 21492 bytes
SHA-256: 79e31fa91783daf68e6435f619698d0472f199872fb98432d9cff1dddb2a36a6
font_02_sfnt_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 16352 bytes
SHA-256: 9c09c88ae8c16bff84111354316359d021997fb4aad4f8972c10b81994a3a1b4
font_03_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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